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Pai river at Pai, Mae Hong Son Province, Thailand.

The Pai River (Thai: แม่น้ำปาย) 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.