Moei River is a natural borderline between Thailand and Myanmar. It is a river of 327 kilometres long, and unlike other river, it flows northward. Its watersource is in Baan Makoe, Tambom Phob Phra.

This river is the borderline between Myanmar and Thailand. It is 327 kilometre long, flowing towards the north unlike a river in general. The watershed is in Ban Mokoe, Tambon Phop Phra, Amphoe Phop Phra. The river flows to Mae Hong Son via Mae Sot, Mae Ramat, and Tha Song Yang, to merge into the Salween River in Myanmar before flowing into the Gulf of Martaban. To get there: Take Highway No. 105 from Mae Sot for around 10 kilometre to the border. If you want to enjoy beautiful sceneries on Moei River and Salween River from a sightseeing boat, go to Baan Suan Aoi, Tambon Songyang. There will be a long-tail boat available for the service at the price of about 5,000 THB (10-15 passengers).