The Songtao Reservoir (Chinese: 松涛水库; pinyin: Sōngtāo Shuǐkù), also known as the Songtao Reservoir Irrigation Area, is the largest body of water in Hainan, and the second largest reservoir in China.

Located upstream of the Nandu River approximately 20 kilometres (12 mi) southeast of Danzhou City, the reservoir covers 0.17 percent of the island and has a total capacity of 3,340,000,000 cubic metres (1.18×10¹¹ cu ft). The reservoir contains more than 100 islands, and is used for agriculture, fisheries, and tourism.