南渡江
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 long, and its tributary, the Xinwu River, is long. Other major rivers include the Wanquan River at -long in the east, Changhua River in the west, and the Sanya River in the south. Evaporation during the dry season around the coastal areas greatly reduces the flow of the rivers.