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Shanghai's location on an alluvial plain means that the vast majority of its 6,340.5 km 2 (2,448.1 sq mi) land area is flat, with an average elevation of 4 m (13 ft). Its sandy soil has required its skyscrapers to be built with deep concrete piles to stop them from sinking into the soft ground of the central area.
Dotted with many rivers and lakes, Shanghai is known for its rich water resources, with the water area accounting for 11 percent of its total territory. Most of the rivers are tributaries of the Huangpu River. Originated from the Taihu Lake, the 113 km Huangpu River winds through the downtown area of the city. The river is about 300 to 770 meters wide with an average width standing at 360 meters. The ice-free river is the main waterway in the Shanghai area.