Sam Phan Bok Canyon Grand circle of rock Rapids as Sam Phan Bok under the Mekong River during the flood because of the Rapids, rocks, it is awash with the force of the tide cycle causes the rapid erosion of stone became a large basin. More than 3000 folding 3 thousands waving Splendid beauty of rocks thukkrasae water erosion so far dented. Perceived as art has a different shape, some large some small, some as an ellipse. Star circle and many others as we would imagine, because there are more than 3000 Fossa here have dubbed "the Gran Canyon short namueang Thai.