Xī Hú (Chinese: 西湖; literally "West Lake") is a famous fresh water lake located in the historic center of Hangzhou, in Zhejiang province of eastern China.
The lake is divided by the causeways of Sū Tí (苏提 / 苏堤) , Bái Tí (白堤), and Yánggōng Tí (杨公堤 / 杨公堤).
About the formation of West Lake, there are few records in ancient documents. "West Lake Sight-Seeing Record" (西湖游览志) of Ming Dynasty, column one, says, "West Lake is surrounded by mountains on three sides. Streams wander down the hills into the pond. There're hundreds of springs underneath. Accumulated water forms the lake." (西湖三面环山，溪谷缕注，下有渊泉百道，潴而为湖。) Modern scholars studied topography, geology, sediment and hydrodynamics, and generally held that West Lake was a lagoon formed gradually from a gulf. In Minguo 9th year (1920), scientist Zhu Kezhen published "The Cause of Formation of West Lake in Hangzhou" (杭州西湖生成的原因) after examining the topography around the lake. He claimed, "West Lake originally was a little bay on left side of Qiantang River. Later the earth in the river sedimented and slowly corked the mouth of the bay, hence a lagoon formed." Zhu even postulated, based on the calculation of sedimentary rate, that West Lake was formed about 12,000 years ago. Zhu also thought when the lake was initially formed, it was even larger than what we saw today. But the creeks coming down from the hills surrounding on three sides brought earth and soils to fill in the lake, so that the water area gradually shrank. West Lake wouldn't have exist today if without all the dredging work done in the history. In 1924, geologist Zhang Hongzhao (章鸿钊) published "One Explanation of the Formation of West Lake". While supporting Zhu's arguments, he supplemented that the formation of West Lake started with tidal force building the lake bank. Later, the alternation of beach helped maintain the water level. These were two prerequisites to the formation of the lake.
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