Sichuan Basin

flowing from Chongqing (bottom left) through the ridge-like detachment folds of the eastern Sichuan Basin (left) and the Three Gorges (top right) to the west The Sichuan Basin is an expansive lowland region in China that is surrounded by upland regions and mountains. Much of the basin is covered in hilly terrain. The basin covers the eastern third of Sichuan Province and the western half of Chongqing Municipality. The westernmost section of the Sichuan Basin is the Chengdu Plain, occupied by Chengdu, provincial capital of Sichuan. The Chengdu Plain is largely alluvial, formed by the Min River and other rivers fanning out when entering the basin from the northwest. This flat region is separated from the rest of the basin by the Longquan Mountains. The central portions of the Sichuan Basin are generally rolling, covered by low hills, eroded remnants of the uplifted Sichuan Basin floor. In some parts of the extreme northern Basin and in Weiyuan County in the southwest, there are ancient dome-shaped low mountains in their own right. The entirety of the Sichuan Basin is drained by the Yangtze River and its tributaries. The main stem of the Yangtze, the Jinsha River, enters the basin in the south at Yibin where it meets the Min River, which enters the basin from the northwest at Dujiangyan City and flows southerly to meet the Jinsha at Yibin where together they form the Yangtze in name. The Dadu River enters from the west and joins the Min at Leshan. The Jialing River enters from the north and flows across the entire width of the Sichuan Basin to meet the Yangtze at Chongqing. Northeast of Chongqing, the Yangtze cuts an outlet through the mountains at the eastern edge of the basin known as the Three Gorges. Other significant rivers almost wholly within the Sichuan Basin include the Tuo River, the Fu River, and the Qu River. Climate Due to the surrounding mountains, the Sichuan Basin often experiences fog and smog as a result of temperature inversion caused by the basin's convective layer being capped by a layer of air moving east across the Tibet Plateau. A moist, often overcast, four-season climate dominates the basin, with cool to mild winters occasionally experiencing frost, and hot, very humid summers. The intensity of summer varies rather widely throughout the basin, depending on location. Generally, the climate is warmer and wetter in the eastern parts of the Sichuan Basin. The basin's climate is classified as humid subtropical under Koppen classification. ==Geology==

The Sichuan Basin forms the rigid northwest edge of the Yangtze tectonic plate. The Yangtze Plate's complex relationship with the surrounding Eurasian Plate is evidenced at its margins. Orogeny formed by the Indian Plate's collision with Eurasia has compressed against the Sichuan Basin's western edge, most notably along the Longmenshan Fault, the epicenter of the 2008 Sichuan Earthquake. The basin's rigidity withstands much of the Tibetan Plateau's eastern movement, but dramatic folds have formed within the Yangtze Plate along the Sichuan Basin's eastern edges. Here, ancient faults interact with the Daba Mountains, themselves a result of pressure between the Yangtze and Eurasian Plates in a perpendicular direction. Until 6 million years ago, a large lake filled the Sichuan Basin. The basin's soils today are largely exposed red sandstone, ==Biodiversity==

Originally, the Sichuan Basin was covered by the Sichuan Basin evergreen broadleaf forests. With human settlement, agriculture has taken root across most of the fertile basin and reduced the original forest to small patches on hills and mountains including Mount Emei. The extensive ridges in the eastern Sichuan Basin preserve elements of the original forests. Previously only known in fossils and thought to be extinct, the Dawn Redwood (Metasequoia glyptostroboides) was rediscovered in 1943 in the hilly Lichuan County, on the eastern mountain fringe of the Sichuan Basin. The Dawn Redwood is distinctive because it is a deciduous conifer. ==Human development==

History prior to annexation by the Qin during the Warring States Period (221 BC) irrigation project Relative to the areas surrounding the upper Yellow River and the North China Plain, the Sichuan Basin has played a peripheral role in the development of Chinese civilization. Due to the fertile agricultural characteristics of the basin, numerous cultures developed prior to integration with ancient Chinese dynasties. Predominant among the known ancient cultures was the Shu State that was independent from the Zhou until it was strategically conquered by the Qin in 316 BCE during the Warring States period. The Sichuan Basin was integrated into Imperial China under Qin dynasty for whom it was an important agricultural resource. After this time, the basin was repopulated with emigrants from China, further assimilating the unique cultures and peoples inhabiting the basin. During the Second Sino-Japanese War when much of Eastern China was occupied by Japanese forces, Chongqing in the Sichuan Basin served as the Republic of China's capital. Sichuan Basin (centre) stands out relative to the more sparsely populated surrounding mountainous regions While population growth stagnated during the Great Leap Forward, it has since recovered. Today, the basin has a population of approximately 100 million. Administratively, the entire basin was part of Sichuan province until Chongqing was separated into a provincial-level municipality in 1997. In addition to Chengdu and Chongqing, significant cities found within the Sichuan Basin include Guangyuan, Mianyang, Deyang, Nanchong, Guang'an, Dazhou, Ya'an, Meishan, Leshan, Ziyang, Suining, Neijiang, Zigong, Yibin, and Luzhou. The former cities of Fuling and Wanzhou are now considered districts within Chongqing, but maintain their status as separate urban centres along the Yangtze. Culture , a dish in Sichuanese cuisine Some unique elements of Sichuanese culture remain in the Basin. Sichuanese cuisine today is renowned for its unique flavours and levels of spiciness. The Sichuanese branch of Mandarin Chinese is barely mutually intelligible with Standard Mandarin and originated in the Sichuan Basin. Today, Sichuanese is spoken throughout eastern Sichuan province, Chongqing, southern Shaanxi, and western Hubei. Transportation carries Expressway G50 from Central China across the Wu Mountains and into the Sichuan Basin While transportation across the Sichuan Basin has been facilitated by relative flatness, access to and from the basin has long been a challenge. Until the construction of the Three Gorges Dam, the Yangtze River was the primary transportation corridor. Connecting the basin with the Yellow River valley to the north, the 4th century BCE Shu Roads were an engineering feat for their time. Most famously, the semi-legendary Stone Cattle Road is said to have been utilized by the Qin to first conquer the Sichuan Basin in 316 BC. Transportation to the west from Sichuan has proven to be an even greater challenge, with steep mountains and deep valleys hindering movement. Nevertheless, the Sichuan Basin has played a role as a stopover on the southern Silk Road and provided the most direct route between India and China. The southern trade route to Tibet also passed through the basin, eventually crossing Kham and the Derge Kingdom to the west. The Long March passed to the west of Sichuan Basin in 1935 with great difficulty. The first rail link to outside the basin was the Baoji–Chengdu Railway, completed in 1961 to connect with Shaanxi province across the Qin Mountains to the north. The basin was also connected with Yunnan to the southwest in 1970, Hubei to the east in 1979, and Guizhou to the south in 2001. In the 21st century, many high-speed rail lines have been built or planned for the Sichuan Basin including the Chengdu-Guiyang and Chengdu-Xi'an lines. Highway construction within Sichuan Basin intensified in the 21st century. Expressways through the basin include the G5, G42, G50, G65, G75, G76, G85, and G93. All expressways that connect the Sichuan Basin with other parts of China have been designed to utilize a series of tunnels and bridges to cross the mountainous surrounding terrain. Notable examples include the long Zhongnanshan Tunnel through the Qin Mountains to the north and the high Sidu River Bridge through the Wu Mountains to the east. Maps gallery Yangtze River drainage basin map.svg|Map of the Yangtze River drainage basin with the Sichuan Basin in the centre China 5.jpg|Map showing the second Shu State in the Sichuan Basin during the Three Kingdoms period Sichuanese in China.png|Sichuanese dialects are spoken in the Sichuan Basin and surrounding areas Shudao.png|The 4th century BC Shu Roads connected Sichuan Basin with the Yellow River valley (Shaanxi) Tea-Horse-Road 2.png|Sichuan Basin in relation to Southeast Asia and the eastern part of South Asia, with the Tea Horse Road routes highlighted in red ==See also==