Mu Ko Chang Marine National Park
Mu Ko Chang, Thailand
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The Yangtze River (English pronunciation: /ˈjæŋtsi/ or /ˈjɑːŋtsi/), known in China as the Chang Jiang, is the longest river in Asia and the third-longest in the world. It flows for 6,418 kilometers (3,988 mi) from the glaciers on the Qinghai-Tibet Plateau in Qinghai eastward across southwest, central and eastern China before emptying into the East China Sea at Shanghai. It is also one of the biggest rivers by discharge volume in the world. The Yangtze drains one-fifth of the land area of the People's Republic of China (PRC) and its river basin is home to one-third of the PRC's population.
Along with the Yellow River, the Yangtze is the most important river in the history, culture and economy of China. The prosperous Yangtze River Delta generates as much as 20% of the PRC's GDP. The Yangtze River flows through a wide array of ecosystems and is itself habitat to several endemic and endangered species including the Chinese alligator and the Yangtze sturgeon. For thousands of years, people have used the river for water, irrigation, sanitation, transportation, industry, boundary-marking and war. The Three Gorges Dam on the Yangtze River is the largest hydro-electric power station in the world.
In recent years, the river has suffered from industrial pollution, agricultural run-off, siltation, and loss of wetland and lakes, which exacerbates seasonal flooding. Some sections of the river are now protected as nature reserves. A stretch of the Yangtze flowing through deep gorges in western Yunnan is part of the Three Parallel Rivers of Yunnan Protected Areas, a UNESCO World Heritage Site.
Early Chinese literature calls the Yangtze River simply 江 (Old Chinese: *kˤroŋ), a character that came to mean any river by the Han Dynasty. The character is a phono-semantic compound, combining 氵 ("water") with the former homophone 工 (today gōng, but pronounced *kˤoŋ in Old Chinese). This Krong was probably a word taken from an Austroasiatic-speaking people in the area such as the Yue, owing to its similarity to Proto-Vietnamese *krong, Mon krung, and other cognates, all meaning "river". The epithet 長 (or the simplified 长), which means "long", was first formally applied to the river during the Six Dynasties period.
Modern geography traces the Yangtze to its source, but traditionally the Chang Jiang proper was considered to begin at the confluence of the Jinsha and Min rivers in southern Sichuan or to follow the Min, which was previously thought to be the main course. Above this, its major tributaries had – and locally still have – other names:
Below Yibin, particular stretches of the Yangtze sometimes acquired local or poetic names: the "Sichuan River" (川江, p Chuānjiāng), named for the adjacent province, is sometimes used to describe the river between Yibin and Yichang; the "Jing River" (荆江, p Jīngjiāng), named for the region and city of Jingzhou, is sometimes given to the next stretch beside Hubei and Hunan; and the "Yangzi River" (t 揚子江, s 扬子江, p Yángzǐjiāng), named for the region and city of Yangzhou, was poetically given to the river just inland from its mouth near present-day Shanghai. (Despite its former popularity among the peoples of the lower Yangtze, who spread it to most European languages, Yangzijiang today is very uncommon within China itself and is typically understood – if at all – as a foreign misnomer.) Among the river's other informal names in Chinese are 大江 (Dàjiāng, the "Big River") and 黄金水道 (Huángjīn Shuǐdào, the "Golden Waterway"), although it shares the latter with the Grand Canal.
The river was called Quian (江) and Quiansui (江水) by Marco Polo and appeared on the earliest English maps as Kian or Kiam, all recording dialects which preserved forms of the Middle Chinese pronunciation of 江 as Kæwng. By the mid-19th century, these romanizations had standardized as Kiang; Dajiang, e.g., was rendered as "Ta-Kiang". "Keeang-Koo", "Kyang Kew", "Kian-ku", and related names derived from mistaking the Chinese term for the mouth of the Yangtze (江口, p Jiāngkǒu) as the name of the river itself.
The name Blue River began to be applied in the 18th century, apparently owing to a former name of the Dam Chu or Min and to analogy with the Yellow River, but it was frequently explained in early English references as a 'translation' of Jiang,Jiangkou, or Yangzijiang. Very common in 18th- and 19th-century sources, the name fell out of favor due to growing awareness of its lack of any connection to the river's Chinese names and to the irony of its application to such a muddy waterway.
The 1615 Latin account of the Jesuit missions to China included descriptions of the "Iansu" and "Iansuchian". The posthumous account's translation of the name as "Son of the Ocean" shows that Ricci, who by the end of his life was fluent in literary Chinese, was introduced to it as the homophonic 洋子江 rather than the 'proper' 揚子江. Further, although railroads and the Shanghai concessions subsequently turned it into a backwater, Yangzhou was the lower river's principal port for much of the Qing Dynasty, directing Liangjiang's important salt monopoly and connecting the Yangtze with the Grand Canal to Beijing. (That connection also made it one of the Yellow River's principal ports between the floods of 1344 and the 1850s, during which time the Yellow River ran well south of Shandong and discharged into the ocean only a few hundred miles away from the mouth of the Yangtze.) By 1800, English cartographers such as Aaron Arrowsmith had adopted the French style of the name as Yang-tse or Yang-tse Kiang. The British diplomat Thomas Wade emended this to Yang-tzu Chiang as part of his formerly popular romanization of Chinese, based on the Beijing dialect instead of Nanjing's and first published in 1867. The spellings Yangtze and Yangtze Kiang was a compromise between the two methods adopted at the 1906 Imperial Postal Conference in Shanghai, which established Postal Map Romanization. Hanyu Pinyin was adopted by the PRC's First Congress in 1958, but it was not widely employed in English outside of mainland China prior to the normalization of diplomatic relations between the United States and the PRC in 1979; since that time, the spelling Yangzi has also been used.
The source and upper reaches of the Yangtze are located in ethnic Tibetan areas of Qinghai. In Tibetan, the Tuotuo headwaters are the Marchu (མར་ཆུ་, w Mar Chu, lit. "Red River"). The Tongtian is the Drichu (འབྲི་ཆུ་, w 'Bri Chu, lit. "River of the Female Yak"; transliterated into Chinese as 直曲, p Zhíqū).
The river originates from several tributaries, two of which have claims to be the source. The PRC government has recognized[when?] the source of the Tuotuo tributary at the base of a glacier lying on the west of Geladandong Mountain in the Dangla Mountain Range on the eastern part of the Qinghai-Tibet Plateau. However, the geographical source (i.e., longest river distance from the sea) lies in wetlands at 32°36′14″N 94°30′44″E / 32.60389°N 94.51222°E / 32.60389; 94.51222 and 5,170 m (16,960 ft) above sea level at the head of the Dan Qu tributary. These tributaries join and the river then runs eastward through Qinghai (Tsinghai), turning southward down a deep valley at the border of Sichuan (Szechwan) and Tibet to reach Yunnan. In the course of this valley, the river's elevation drops from above 5,000 m (16,000 ft) to less than 1,000 m (3,300 ft). The headwaters of the Yangtze are situated at an elevation of about 4,900 m (16,100 ft). In its descent to sea level, the river falls to an altitude of 305 m (1,001 ft) at Yibin, Sichuan, the head of navigation for riverboats, and to 192 m (630 ft) at Chongqing (Chungking). Between Chongqing and Yichang (I-ch'ang), at an altitude of 40 m (130 ft) and a distance of about 320 km (200 mi), it passes through the spectacular Yangtze Gorges, which are noted for their natural beauty but are dangerous to shipping.
It enters the basin of Sichuan at Yibin. While in the Sichuan basin, it receives several mighty tributaries, increasing its water volume significantly. It then cuts through Mount Wushan bordering Chongqing and Hubei to create the famous Three Gorges. Eastward of the Three Gorges, Yichang is the first city on the Yangtze Plain.
After entering Hubei, the Yangtze receives more water from thousands of lakes.[weasel words] The largest of these lakes is Dongting Lake, which is located on the border of Hunan and Hubei provinces, and is the outlet for most of the rivers in Hunan. At Wuhan, it receives its biggest tributary, the Han River, bringing water from its northern basin as far as Shaanxi.
At the northern tip of Jiangxi, Lake Poyang, the biggest freshwater lake in China, merges into the river. The river then runs through Anhui and Jiangsu provinces, receiving more water from innumerable smaller lakes and rivers, and finally reaches the East China Sea at Shanghai.
Four of China's five main freshwater lakes contribute their waters to the Yangtze River. Traditionally, the upstream part of the Yangtze River refers to the section from Yibin to Yichang; the middle part refers to the section from Yichang to Hukou County, where Lake Poyang meets the river; the downstream part is from Hukou to Shanghai. It is home to many thousands of people.[weasel words]
The origin of the Yangtze River is dated to about 45 million years ago in the Eocene, but many people[who?] do not accept this point.
The glaciers of the Tanggula Mountains, the source of the Yangtze River
The Tuotuo River, a headwater stream of the Yangtze River, known in Tibetan as Maqu, or the "Red River"
The first turn of the Yangtze at Shigu (石鼓) in Yunnan Province, where the river turns 180 degrees from south- to north-bound
The Jinsha River in Yunnan
The Tiger Leaping Gorge near Lijiang downstream from Shigu
Qutang Gorge, one of the Three Gorges
The Yangtze flows into the East China Sea and was navigable by ocean-going vessels up a thousand miles from its mouth even before the Three Gorges Dam was built. As of June 2003, this dam spans the river, flooding Fengjie, the first of a number of towns affected by the massive flood control and power generation project. This is the largest comprehensive irrigation project in the world and has a significant impact on China's agriculture. Its proponents argue that it will free people living along the river from floods that have repeatedly threatened them in the past and will offer them electricity and water transport—though at the expense of permanently flooding many existing towns (including numerous ancient cultural relics) and causing large-scale changes in the local ecology.
Opponents of the dam point out that there are three different kinds of floods on the Yangtze River: floods which originate in the upper reaches, floods which originate in the lower reaches, and floods along the entire length of the river. They argue that the Three Gorges dam will actually make flooding in the upper reaches worse and have little or no impact on floods which originate in the lower reaches. Twelve hundred years of low water marks on the river were recorded in the inscriptions and the carvings of carp at Baiheliang, now submerged.
The Yangtze is flanked with metallurgical, power, chemical, auto, building materials and machinery industrial belts and high-tech development zones. It is playing an increasingly crucial role in the river valley's economic growth and has become a vital link for international shipping to the inland provinces. The river is a major transportation artery for China, connecting the interior with the coast.
The river is one of the world's busiest waterways. Traffic includes commercial traffic transporting bulk goods such as coal as well as manufactured goods and passengers. Cargo transportation reached 795 million tons in 2005. River cruises several days long, especially through the beautiful and scenic Three Gorges area, are becoming popular as the tourism industry grows in China.
Flooding along the river has been a major problem. The rainy season in China is May and June in areas south of Yangtze River, and July and August in areas north of it. The huge river system receives water from both southern and northern flanks, which causes its flood season to extend from May to August. Meanwhile, the relatively dense population and rich cities along the river make the floods more deadly and costly. The most recent major floods were the 1998 Yangtze River Floods, but more disastrous were the 1954 Yangtze River Floods, killing around 30,000 people. Other severe floods included those of 1911, which killed around 100,000, 1931 (145,000 dead), and 1935 (142,000 dead).
Although the mouth of the Yellow River has fluctuated widely north and south of the Shandong peninsula within the historical record, the Yangtze has remained largely static. Based on studies of sedimentation rates, however, it is unlikely that the present discharge site predates the late Miocene (c. 11 Ma). Prior to this, its headwaters drained south into the Gulf of Tonkin along or near the course of the present Red River.
The Yangtze River is important to the cultural origins of southern China. Human activity has been verified in the Three Gorges area as far back as 27,000 years ago, and by the 5th millennium BC, the lower Yangtze was a major population center occupied by the Hemudu and Majiabang cultures, both among the earliest cultivators of rice. By the 3rd millennium BC, the successor Liangzhu culture showed evidence of influence from the Longshan peoples of the North China Plain. A study of Liangzhu remains around the mouth of the Yangtze found a high prevalence of haplogroup O1, linking it to modern Austronesian and Daic populations; the same study found the rare haplogroup O3d at a Daxi site on the central Yangtze, connecting it with the modern Hmong. What is now thought of as Chinese culture developed along the more fertile Yellow River basin; the rice-growing "Yue" people of the lower Yangtze possessed very different traditions – blackening their teeth, cutting their hair short, tattooing their bodies, and living in small settlements among bamboo groves – and were considered barbarous by the northerners.
In the lower Yangtze, two Yue tribes, the Gouwu in southern Jiangsu and the Yuyue in northern Zhejiang, display increasing Chinese influence from the 9th century BC. Traditional accounts credit these changes to northern refugees (Taibo and Zhongyong in Wu and Wuyi in Yue) who assumed power over the local tribes. As the Chinese kingdoms of Wu and Yue, they were famed as fishers, shipwrights, and sword-smiths. Adopting Chinese characters, political institutions, and military technology, they were among the most powerful states during the later Zhou.
In the middle Yangtze, the state of Jing seems to have gone the other direction: archaeological excavation has shown it beginning as a Chinese civilization but adopting greater and greater native influence over time as it expanded south and east from its original base in Henan. In the process, it changed its name to Chu.
Whether native or nativizing, the Yangtze states held their own against the northern Chinese homeland: some lists credit them with three of the Spring and Autumn Period's Five Hegemons and one of the Warring States' Four Lords. They fell in against themselves, however. Chu's growing power led its rival Jin to support Wu as a counter. Wu successfully sacked Chu's capital Ying in 506 BC, but Chu subsequently supported Yue in its attacks against Wu's southern flank. In 473 BC, King Goujian fully annexed Wu and moved his court to its eponymous capital at modern Suzhou. In 333 BC, Chu finally united the lower Yangtze by annexing Yue, whose royal family was said to have fled south and established the Minyue kingdom in Fujian. Qin was able to unite China by first subduing Ba and Shu on the upper Yangtze in modern Sichuan, giving them a strong base to attack Chu's settlements along the river.
Shi Huangdi regularized policies across his empire, including in the annexed Yangtze states. He then used its connections to the Yunmeng Marsh and the Xiang River to expand China into Hunan and Guangdong, setting up military commanderies along the main lines of communication. At the collapse of the Qin Dynasty, these southern commanderies became the independent Nanyue Empire under Zhao Tuo while Chu and Han vied with each other for control of the north.
From the Han Dynasty, the region of the Yangtze River became more and more important to China's economy. The establishment of irrigation systems (the most famous one is Dujiangyan, northwest of Chengdu, built during the Warring States period) made agriculture very stable and productive. By the Song dynasty, the area along the Yangtze had become among the wealthiest and most developed parts of the country, especially in the lower reaches of the river. Early in the Qing dynasty, the region called Jiangnan (that includes the southern part of Jiangsu, the northern part of Zhejiang, and the southeastern part of Anhui) provided 1/3–1/2 of the nation's revenues.
The Yangtze has long been the backbone of China's inland water transportation system, which remained particularly important for almost two thousand years, until the construction of the national railway network during the 20th century. The Grand Canal connects the lower Yangtze with the major cities of the Jiangnan region south of the river (Wuxi, Suzhou, Hangzhou) and with northern China (all the way to Beijing). The less well known ancient Lingqu Canal, connecting the upper Xiang River with the headwaters of the Guijiang, allowed a direct water connection from the Yangtze Basin to the Pearl River Delta.
Historically, the Yangtze became the political boundary between north China and south China several times (see History of China) because of the difficulty of crossing the river. This occurred notably during the Southern and Northern Dynasties, and the Southern Song. Many battles took place along the river, the most famous being the Battle of Red Cliffs in 208 AD during the Three Kingdoms period.
Politically, Nanjing was the capital of China several times, although most of the time its territory only covered the southeastern part of China, such as the Wu kingdom in the Three Kingdoms period, the Eastern Jin Dynasty, and during the Southern and Northern Dynasties and Five Dynasties and Ten Kingdoms periods. Only the Ming occupied most parts of China from their capital at Nanjing, though it later moved the capital to Beijing. The ROC capital was located in Nanjing in the periods 1911–12, 1927–37, and 1945–49.
The first merchant steamer in China, the Jardine, was built to order for the firm of Jardine Matheson in 1835. She was a small vessel intended for use as a mail and passenger carrier between Lintin Island, Macao and Whampoa. However, after several trips, the Chinese authorities, for reasons best known to themselves, prohibited her entrance into the river. Lord Palmerston, the British Foreign Secretary who personified gunboat diplomacy, decided to wage war on China mainly on the "suggestions" of Jardine Matheson. In mid-1840, a large fleet of warships appeared on the China coast, and with the first cannon fire aimed at a British ship, the Royal Saxon, the British started the First Opium War. The Imperial Government, forced to surrender, gave in to the demands of the British. British military superiority was clearly evident during the armed conflict. British warships, constructed using such innovations as steam power combined with sail and the use of iron in shipbuilding, wreaked havoc on coastal towns; such ships (like the Nemesis) were not only virtually indestructible but also highly mobile and able to support a gun platform with very heavy guns. In addition, the British troops were armed with modern muskets and cannons, unlike the Qing forces. After the British took Canton, they sailed up the Yangtze and took the tax barges, a devastating blow to the Empire as it slashed the revenue of the imperial court in Beijing to just a small fraction of what it had been.
In 1842, the Qing authorities sued for peace, which concluded with the Treaty of Nanjing signed on a gunboat in the river, negotiated in August of that year and ratified in 1843. In the treaty, China was forced to pay an indemnity to Britain, open five ports to Britain, and cede Hong Kong to Queen Victoria. In the supplementary Treaty of the Bogue, the Qing empire also recognized Britain as an equal to China and gave British subjects extraterritorial privileges in treaty ports.
The US, at the same time, wanting to protect its interests and expand trade, ventured the USS Wachusett six-hundred miles up the river to Hankow in about 1860, while the USS Ashuelot, a sidewheeler, made her way up the river to Ichang in 1874. The first USS Monocacy, a sidewheel gunboat, began charting the Yangtze River in 1871. The first USS Palos, an armed tug, was on Asiatic Station into 1891, cruising the Chinese and Japanese coasts, visiting the open treaty ports and making occasional voyages up the Yangtze River. From June to September 1891, anti-foreign riots up the Yangtze forced the warship to make an extended voyage as far as Hankow, 600 miles upriver. Stopping at each open treaty port, the gunboat cooperated with naval vessels of other nations and repairing damage. She then operated along the north and central China coast and on the lower Yangtze until June 1892. The cessation of bloodshed with the Taiping Rebellion, Europeans put more steamers on the river. The French, not to sit idle and get rice crumbs, engaged the Chinese in war over the rule of Vietnam. The Sino-French Wars of the 1880s emerged with the Battle of Shipu having French cruisers in the lower Yangtze.
The China Navigation Company was an early shipping company founded in 1876 in London, initially to trade up the Yangtze River from their Shanghai base with passengers and cargo. Chinese coastal trade started shortly after and in 1883 a regular service to Australia was initiated. Most of the company's ships were seized by Japan in 1941 and services did not resume until 1946. Robert Dollar was a later shipping magnate, who became enormously influential moving Californian and Canadian lumber to the Chinese and Japanese market.
Yichang, or Ichang, 1,600 km (990 mi) from the sea, is the head of navigation for river steamers; oceangoing vessels may navigate the river to Hankow, a distance of almost 1,000 km (almost 600 mi) from the sea. For about 320 km (200 mi) inland from its mouth, the river is virtually at sea level.
The Chinese Government, too, had steamers. It had its own naval fleet, the Nanyang Fleet, which fell prey to the French fleet. The Chinese would rebuild its fleet, only to be ravaged by another war with Japan (1895), Revolution (1911) and ongoing inefficiency and corruption. Chinese companies ran their own steamers, but were second tier to European operations at the time.
Steamers came late to the upper river. The three gorges and the strong current hindered plans. Achibald Little attempted a voyage with the Lee-Chuan, and the Kuling, delays and weak engines meant that he only succeeded in the first vessel in 1898. Little soon built the first truly successful boat, the Pioneer, about 1899 — she plied the river for two more decades and was even the flagship for the British Royal Navy on the China Station. There were a few commercial steamers on the upper river by the start of the 20th century and the Boxer Rebellion. The commercial firms of Jardine Matheson, Butterfield and Swire and Standard Oil had their own steamers on the river. Until 1881, the India and China coastal and river services were operated by several companies. In that year, however, these were merged into the Indo-China Steam Navigation Company Ltd, a public company under the management of Jardine's. The Jardine company pushed inland up the Yangtsze River on which a specially designed fleet was built to meet all requirements of the river trade. For many years, this fleet gave unequalled service. Jardine's established an enviable reputation for the efficient handling of shipping. As a result, the Royal Mail Steam Packet Company invited the firm to attend to the Agency of their Shire Line which operated in the Far East. Standard Oil ran the tankers Mei Ping, Mei An and Mei Hsia, which were all destroyed on December 12, 1937 when Japanese warplanes bombed and sank the U.S.S. Panay. One of the Standard Oil captains who survived this attack had served on the Upper River for 14 years.
With the Treaty Ports, the European powers and Japan were allowed to float navy ships into China's internal waters. The British, Americans and French did this. A full international fleet featured on Chinese waters: Austro-Hungarian, Portuguese, Italian, Russian and German navy ships came to Shanghai and the treaty ports. The Japanese engaged in open war with the Chinese twice, and Russians twice, over conquest of the Chinese Qing Empire—in the First and Second Sino-Japanese War 1895, and 1905; and the Russo-Japanese War of 1904. Incidentally, both the French and Japanese navies were heavily involved in running opium and narcotics to Shanghai, where it was refined into morphine. It was then transhipped by liner back to Marseille and France (i.e. French Connection) for processing in Germany and eventual sale in the U.S. or Europe.
In 1909 the gunboat USS Samar changed station to Shanghai, where she regularly patrolled the lower Yangtze River up to Nanking and Wuhu. Following an anti-foreign riots in Changsha in April 1910, which destroyed a number of missions and merchant warehouses, Samar sailed up the Yangtze River to Hankow and then Changsa to show the flag and help restore order. The gunboat was also administratively assigned to the Asiatic Fleet that year, which had been reestablished by the Navy to better protect, in the words of the Bureau of Navigation, "American interests in the Orient." After returning to Shanghai in August, she sailed up river again the following summer, passing Wuhu in June but then running aground off Kichau on July 1, 1911.
After staying stuck in the mud for two weeks, Samar broke free and sailed back down river to coal ship. Returning upriver, the gunboat reached Hankow in August and Ichang in September where she wintered over owing to both the dry season and the outbreak of rebellion at Wuchang in October 1911. Tensions eased and the gunboat turned downriver in July 1912, arriving at Shanghai in October. Samar patrolled the lower Yangtze after fighting broke out in the summer 1913, a precursor to a decade of conflict between provincial warlords in China. In 1919, she was placed on the disposal list at Shanghai following a collision with a Yangtze River steamer that damaged her bow.
The Spanish boats were replaced in the 1920s by the Luzon and Mindanao were the largest, USS Oahu and Panay next in size, and Guam and Tutuila the smallest. China in the first fifty years of the 20th century, was in low-grade chaos. Warlords, revolutions, natural disasters, civil war and invasions contributed. Yangtze boats were involved in the Nanking Incident in 1927 when the Communists and Nationalists broke into open war. The Chiang Kai-shek's massacre of the Communists in Shanghai in 1927 furthered the unrest, U.S. Marines with tanks were landed. River steamers were popular targets for both Nationalists and Communists, and peasants who would take periodic pot-shots at vessels. During the course of service the second USS Palos protected American interests in China down the entire length of the Yangtze, at times convoying U.S. and foreign vessels on the river, evacuating American citizens during periods of disturbance and in general giving credible presence to U.S. consulates and residences in various Chinese cities. In the period of great unrest in central China in the 1920s, Palos was especially busy patrolling the upper Yangtze against bands of warlord soldiers and outlaws. The warship engaged in continuous patrol operations between Ichang and Chungking throughout 1923, supplying armed guards to merchant ships, and protecting Americans at Chungking while that city was under siege by a warlord army.
The British Royal Navy had a series of Insect class gunboats which patrolled between Chungking and Shanghai. Cruisers and destroyers and Fly class vessels also patrolled. The most infamous incident was when USS Panay and HMS Bee in 1937, were dive-bombed by Japanese aeroplanes during the notorious Nanking Massacre. The Westerners were forced to leave the Yangtze River with the Japanese takeover in 1941. The former steamers were either sabotaged or pressed into Japanese or Chinese service. Probably the most curious incident involved HMS Amethyst in 1949 during the Chinese Civil War between Kuomintang and People's Liberation Army forces; and led to the award of the Dickin Medal to the ship's cat Simon.
Beginning in the 1950s dams and thousands of kilometres of dykes were built for flood control, land reclamation, irrigation and for the control of diseases vectors such as blood flukes that caused Schistosomiasis. More than a hundred lakes were thus cut off from the main river. There were gates between the lakes that could be opened during floods. However, farmers and settlements encroached on the land next to the lakes although it was forbidden to settle there. When floods came, it proved impossible to open the gates since it would have caused substantial destruction. Thus the lakes partially or completely dried up. For example, Baidang Lake shrunk from 100 square kilometers (39 sq mi) in the 1950s to 40 square kilometers (15 sq mi) in 2005. Zhangdu Lake dwindled to one quarter of its original size. Natural fisheries output in the two lakes declined sharply. Only a few large lakes, such as Poyang Lake and Dongting Lake, remained connected to the Yangtze. Cutting off the other lakes that had served as natural buffers for floods increased the damage done by floods further downstream. Furthermore, the natural flow of migratory fish was obstructed and biodiversity across the whole basin decreased dramatically. Intensive farming of fish in ponds spread using one type of carp who thrived in eutrophic water conditions and who feeds on algae, causing widespread pollution. The pollution was exacerbated by the discharge of waste from pig farms as well as of untreated industrial and municipal sewage. In September 2012, the Yangzte river near Chongqing turned red from pollution. The erection of the Three Gorges Dam has created an impassable "iron barrier" that has led to a great reduction in the biodiversity of the river. Yangtze sturgeon use seasonal changes in the flow of the river to signal when is it time to migrate. However, these seasonal changes will be greatly reduced by dams and diversions. Other animals facing immediate threat of extinction are the Baiji Dolphin, finless porpoise and the Yangtze Alligator. These animals numbers went into freefall from the combined effects of accidental catches during fishing, river traffic, habitat loss and pollution. In 2006 the baiji dolphin went extinct; the world lost an entire genus.
In 2002 a pilot program was initiated to reconnect lakes to the Yangtze with the objective to increase biodiversity and to alleviate flooding. The first lakes to be reconnected in 2004 were Zhangdu Lake, Honghu Lake, and Tian'e-Zhou in Hubei province on the middle Yangtze. In 2005 Baidang Lake in Anhui Province was also reconnected.
Reconnecting the lakes improved water quality and fish were able to migrate from the river into the lake, replenishing their numbers and genetic stock. The trial also showed that reconnecting the lake reduced flooding. The new approach also benefitted the farmers economically. Pond farmers switched to natural fish feed, which helped them breed better quality fish that can be sold for more, increasing their income by 30%. Based on the successful pilot project, other provincial governments emulated the experience and also reestablished connections to lakes that had previously been cut off from the river. In 2005 a Yangtze Forum has been established bringing together 13 riparian provincial governments to manage the river from source to sea. In 2006 China’s Ministry of Agriculture made it a national policy to reconnect the Yangtze River with its lakes. As of 2010, provincial governments in five provinces and Shanghai set up a network of 40 effective protected areas, covering 16,500 km2 (6,400 sq mi). As a result, populations of 47 threatened species increased, including the critically endangered Yangtze alligator. In the Shanghai area, reestablished wetlands now protect drinking water sources for the city. It is envisaged to extend the network throughout the entire Yangtze to eventually cover 102 areas and 185,000 km2 (71,000 sq mi). The mayor of Wuhan announced that six huge, stagnating urban lakes including the East Lake (Wuhan) would be reconnected at the cost of US$ 2.3 billion creating China’s largest urban wetland landscape.
Until 1957, there were no bridges across the Yangtze River from Yibin to Shanghai. For millennia, travelers crossed the river by ferry. On occasions, the crossing may have been dangerous, as evidenced by the Zhong’anlun disaster (October 15, 1945).
The river stood as a major geographic barrier dividing northern and southern China. In the first half of the 20th century, rail passengers from Beijing to Guangzhou and Shanghai had to disembark, respectively, at Hanyang and Pukou, and cross the river by steam ferry before resuming journeys by train from Wuchang or Nanjing West.
After the founding of the People's Republic in 1949, Soviet engineers assisted in the design and construction of the Wuhan Yangtze River Bridge, a dual-use road-rail bridge, built from 1955 to 1957. It was the first bridge across the Yangtze River. The second bridge across the river was built a single-track railway bridge built upstream in Chongqing in 1959. The Nanjing Yangtze River Bridge, also a road-rail bridge, was the first bridge to cross the lower reaches of the Yangtze, in Nanjing. It was built after the Sino-Soviet Split and did not receive foreign assistance. Road-rail bridges were then built in Zhicheng (1971) and Chongqing (1980).
Bridge-building slowed in the 1980s before resuming in the 1990s and accelerating in the first decade of the 21st century. The Jiujiang Yangtze River Bridge was built in 1992 as part of the Beijing-Jiujiang Railway. A second bridge in Wuhan was completed in 1995. By 2005, there were a total of 56 bridges and one tunnel across the Yangtze River between Yibin and Shanghai. These include some of the longest suspension and cable-stayed bridges in the world on the Yangtze Delta: Jiangyin Suspension Bridge (1,385 m, opened in 1999), Runyang Bridge (1,490 m, opened 2005), Sutong Bridge (1,088 m, opened 2008). The rapid pace of bridge construction has continued. The city of Wuhan now has six bridges and one tunnel across the Yangtze.
A number of power line crossings have also been built across the river.
Wuhan Yangtze River Bridge, the first bridge crossing Yangtze, was completed in 1957.
The Nanjing Yangtze River Bridge, a beam bridge, was completed in 1968.
The Jiujiang Yangtze River Bridge, an arch bridge, was completed in 1992.
The Yichang Yangtze Highway Bridge, a suspension bridge near the Gezhouba Dam lock, was completed in 1996.
The Sutong Yangtze River Bridge, between Nantong and Suzhou, was one of the longest cable-stayed bridges in the world when it was completed in 2008.
The Caiyuanba Bridge, an arch bridge in Chongqing, was completed in 2007.
The cable-stayed bridge at Anqing, was completed in 2005.
As of 2007, there are two dams built on the Yangtze river: Three Gorges Dam and Gezhouba Dam. Several dams are being constructed on the upper portion of the river, the Jinsha River.
The Yangtze River has over 700 tributaries. The major tributaries (listed from upstream to downstream) with the locations of where they join the Yangtze are:
Gan River in Jiangxi Province
Han River in Hubei Province
Lake Dongting and the Yuan, Zi, Li and Xiang Rivers in Hunan Province
Wu River in Guizhou Province
Jialing River in eastern Sichuan Province and Chongqing Municipality
Min River in central Sichuan
Yalong River in western Sichuan
Due to commercial use of the river, tourism, and pollution, the Yangtze is home to at least four seriously threatened species of large animals: The Chinese alligator, the finless porpoise, the Chinese paddlefish, and the Yangtze River dolphin or baiji. This is the only other place besides the United States that is native to an alligator and paddlefish species. In 2010, the Yangtze population of finless porpoise was 1000 individuals. In December 2006, the Yangtze River dolphin was declared functionally extinct after an extensive search of the river revealed no signs of the dolphin's inhabitance. In 2007, a large, white animal was sighted and photographed in the lower Yangtze and was tentatively presumed to be a baiji. However, as there have been no confirmed sightings since 2004, the baiji is presumed to be functionally extinct at this time. "Baijis were the last surviving species of a large lineage dating back seventy million years and one of only six species of freshwater dolphins". It has been argued that the extinction of the Yangtze River dolphin was a result of the completion of the Three Gorges Dam, a project that has affected many species of animals and plant life found only in the gorges area.
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