Sam Phan Bok is located in Ban Pong Pao, Lao Ngam Sub-district, Pho Sai District, Ubon Ratchathani Province, which is approximately 120 kilometers from the city center of the province. Sam Phan Bok is a large rock islet in the Khong River. During flood season, this islet will submerge under the water. It is eroded by eddy current, resulting in more than 3,000 (pronounced Sam Phan in Thai) small basins or Bok (“Bok” in Lao language means “basins”). This is the history of the name
“Sam Phan Bok.” Owing to the large number of basins, this place is dubbed as “Grand Canyon of Thailand.”