Phu Soi Dao (French: Phou Soai Dao) is a mountain in Southeast Asia.

It is 2120 metres tall and rises at the south end of the Luang Prabang Range, on the border between Laos and Thailand.

[1] Phu Soi Dao National Park is on the Thai side of the range in Phitsanulok and Uttaradit Provinces.

[2] Pinus kesiya, Betula alnoides, Schima wallichii and Shorea siamensis are among the species of trees present in the forest.

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