Songtao Shuiku, dam in Hainan

Songtao Shuiku is a reservoir on the upper Nandu River, spanning the border of Danzhou and Baisha County in Hainan. Its main dam, a rolled homogeneous earth-fill structure 730 m long and 80.1 m high, stands in the Qinzukou gorge west of Fanya village, Lanyang town. The normal water surface covers 130.5 km² and holds over 100 islands.

Construction of the Songtao Reservoir began in July 1958 and the project was completed in 1970. Its dam, a rolled homogeneous earth-fill structure 730 m long with a maximum height of 80.1 m, stands in the Qinzukou gorge west of Fanya village in Lanyang town, Danzhou. The reservoir controls a catchment of 1,496 km², 20.8% of the Nandu River basin.

The reservoir's name, Songtao, means "pine waves", referring to wind moving through the pines of the surrounding hills. It lies across the border of Danzhou and Baisha County, and its water is drawn from the upper Nandu River. The reservoir is used for irrigation, fisheries and tourism, and more than 100 islands lie within it.

The dam stands in the Qinzukou gorge west of Fanya village in Lanyang town, about 20 km southeast of Danzhou; the crest runs 730 m and rises 80.1 m. The reservoir lies upstream on the Nandu River, and its more than 100 islands are reached by boat.

The main dam stands in the Qinzukou gorge west of Fanya village in Lanyang, a rolled homogeneous earth-fill structure 730 metres long with a maximum height of 80.1 metres. Its catchment of 1,496 square kilometres covers 20.8 percent of the Nandu River basin.