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Rivers and lakes

Most of the rivers in Hainan originate in the central area of the island and flow radially in different directions. The Nandu River in the northern part of the island is 314 km (195 mi) long, and its tributary, the Xinwu River, is 109 km (68 mi) long. Other major rivers include the Wanquan River at 162 km (101 mi) -long in the east, Changhua River in the west, and the Sanya and Taiyang Rivers in the south. Evaporation during the dry season around the coastal areas greatly reduces the flow of the rivers.

There are very few natural lakes in Hainan. However, there are numerous reservoirs, the largest of which is the Songtao Reservoir in the central-north area.