Ключевые слова: ancient, asia, asian, beautiful, canyon, cascade, cave, cavern, dark, environment, fall, falls, geology, landscape, laos, limestone, luang, luang prabang, mountain, natural, nature, outdoors, prabang, river, rock, rocks, sea, stalactite, stalagmite, stone, stream, thai, thailand, tourism, travel, underground, water, waterfall, waterfalls,