Phu Khi SukPhu Khi Suk is a mountain in Ubon Ratchathani Province, Thailand.GeographyPhu Khi Suk is the highest peak of the Dângrêk Range, rising at the east end of the long mountain chain. It is close to the Chong Bok area, a tripoint where the borders of Thailand, Laos, and Cambodia intersect.