Ключевые слова: abstract, ancient, asia, asian, bark, brown, canyon, cave, cliff, geology, gorge, grotto, hole, landscape, laos, luang, luang prabang, mineral, mountain, natural, nature, old, pattern, prabang, river, rock, rocks, speleology, stalactite, stalagmite, stone, texture, thai, thailand, tourism, travel, tree, underground, wall, water, waterfall, wood,