Songkhla Lake is the only lake in Thailand adjacent to 3 provinces covering an area of ​​about 1,000 square kilometers, namely, Phatthalung. In the district of Phatthalung. Amphoe Khao Chai San and Amphoe Khuan Khanun, Songkhla Province in Amphoe Ranot, Amphoe Sathing Phra, Amphoe Sisaket, Amphoe Singhanakhon, Amphoe Mueang Songkhla. Kuan Niang District, Hat Yai District and Cha-uat District Nakhon Sri Thammarat

Songkhla Lake receives water from the mountain range and the mountain range from Sikao. All flow into Songkhla Lake. Basin in this bar. There are three waters in the lake: fresh water, brackish water and salt water. There are rivers and canals flowing into this lake. Water always changes seasonally. Depending on the currents in the rivers flowing into the lake. And ocean currents It makes water changes all the time. The Lower Songkhla Lake has a large island in Koh Yao, and there are many other islands that are home to the bird nesting quarters.