Dong Taijnar Hu

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Lake in the Qaidam Basin of northwestern Qinghai province.

When a highland river flows into an area with a lower elevation, the river's flow causes erosion of sediments from the higher area to the lower area. As this process continues, sediments of earth are deposited in the lower area and a fan-shaped deposit of sediments is formed, with the smallest part of the fan at the high-elevation river inlet. The resulting geographical feature is called an alluvial fan. Here, the inlet river Dong Taijnar He has formed an alluvial fan as its waters flow north into a lower elevation. The build-up of sediment deposits has caused the river to split into several segments that fan out to the northwest and northeast. This splitting up of the river has led to the formation of two major lakes at the edges of the alluvial fan: Xi Taijnar Hu, and Dong Taijnar Hu.