unseen thailand landscape view of rock holes stone in sam-pan-bok grand canyon or the mekong river in thai grand canyon with sunri

amazing ancient asia background beautiful beauty blue canal canyon chasm deep desert gorge grand gully hard hillock hole holes hot landscape mekong nature old pit ratchathani reflect river riverbank riverside rock sampanbok scene scour sky stone summer sunlight sunri sunrise sunset thai thailand tourist travel tropical ubon ubonratchathani unseen valley view water watercourse wave