Nandu River, also known as Qingleishui, is the only river in Leizhou Peninsula with a water collection area greater than 1,000 square kilometers. It belongs to the South China Sea system. It is the largest river in the hinterland of Leizhou Peninsula in Guangdong Province. It originates from Pozai, Suixi County, Guangdong Province, and flows into Leizhou Bay of the South China Sea at Shuangxikou, Haikang County. The main stream is 88 kilometers long and has a drainage area of ??1,444 square kilometers, accounting for 40.8% of the area of ??Haikang County. . The widest point is 200 meters, the average river width is 31.13 meters, the total river drop is 27.9 meters, and the river bed slope is 0.172‰. The tributaries in the basin covering an area of ??more than 100 square kilometers include Tutang River, Gonghe River, Songzhu River and Huaqiao River.