Ing River Si Don Chai, Chiang Khong, Chiang Rai. Watershed originated from the mountains in Mae Chai District, Phayao Province, flowing through Chiang Kham District, Thoeng District, into the Mekong River in Chiang Khong District, called Sop Ing, with a length of approximately 136 kilometers.

 

Chiang Rai people, especially Thoeng people Phaya Mengrai District Chiang Khong District Use in agriculture such as rice, vegetables.