
22 river basins according to the Royal Decree on River Basins, B.E. 2564 (2021).
- Salween River Basin
- Upper Mekong Basin
- Northeast Mekong Basin
- Chi River Basin
- Mun River Basin
- Ping River Basin
- Wang River Basin
- Yom River Basin
- Nan River Basin
- Chao Phraya River Basin
- Sakae Krang River Basin
- Pa Sak River Basin
- Tha Chin River Basin
- Mae Klong River Basin
- Bang Pakong River Basin
- Tonle Sap Basin
- Eastern coastal basin
- Phetchaburi-Prachuap Khiri Khan River Basin
- Upper eastern part of the southern river basin
- Songkhla Lake Basin
- Lower East Coast Southern River Basin
- The western part of southern Thailand's river basin.
