The Pai River (Thai: แม่น้ำปาย, Thai pronunciation: [mɛ̂ːnáːm paːj]; RTGS: Maenam Pai) is a river that originates in the mountains of the Daen Lao Range, Pai District, Mae Hong Son Province, Thailand. The river flows first in a north-south direction and then in an east-west direction down to Mueang Mae Hong Son District and across the Thai/Burmese border. The river tributes the Salween River in Kayah State, Burma. It is 180 kilometres (110 mi) long.
|State||Mae Hong Son Province (Thailand), Kayah State (Burma)|
|• location||Daen Lao Range, Pai District, Mae Hong Son Province, Thailand|
|• elevation||1,170 m (3,840 ft)|
|Punghsa-se, Kayah State, Burma|
|111 m (364 ft)|
|Length||180 km (110 mi)|
Its name in the Lanna language () means "male elephant", comparable to the word "Plai" in the central Thai language. There is a story that in 1477 during the reign of King Tilokaraj, who was the ruler of Lanna Kingdom. He ordered his cousin Prince Si Chaiya to attack Ban Don. Meanwhile, one of his white elephants fled, he ordered the soldiers to find and found that it was swimming in this river.
Pai River is popular for whitewater rafting. Rapids on the river vary from class I to class IV on the International Scale of River Difficulty and everything in between. back in 2006 a dutch tourist name Susan van Amerom age of 21 was fall of the PVC boat by accident and died in Pai river Run by Guide Tep on a rafting company call Pai Adventure that later on was changing the owner.[clarification needed] Other than that The Pai River offers a scenic view of mountain forest and many choose to camp along the quiet river banks.
- Pai River in Mae Hong Son
- A New Cyprinid Fish, Hampala salweenensis, from the Mae Pai River
- Huai Nam Dang National Park