This lake is the largest lake in Thailand covering an area of approximately 80 kilometers long and 20 to 25 kilometers wide in Songkhla and Phatthalung Provinces. In addition, it is the only natural, fresh-water lake in Thailand. Several islands across from its mouth namely, Ko Yai, Ko Si, Ko Ha, Ko Kaeo, Ko Mak, Ko Rai, and Ko Yo are worth visiting for relaxation. Boat services are available for touring the lake. The port behind the post office or the fresh market has all-day long-tailed boat services.
- Phathammarong Museum
- Wat Chai Mongkhon