This large man-made dam was built to provide hydro-electricity for Surat Thani and other towns. Over 100 islands dot this massive lake, most of the clustered in the narrowest part of the lake, an area known as 'Chong Kaeb Khao Ka Loh'. The dam is a 65 Km. drive from Headquarters. Local people run boat trips and trekking around the Dam as part of an eco-tourism project.