Ключевые слова: abstract, ancient, background, beach, beautiful, bright, cave, cavern, caving, dark, darkness, deep, entrance, exploration, geologic, geological, geology, hole, idyllic, inside, interior, lake, landmark, landscape, light, limestone, lod, mountain, mysterious, natural, nature, nobody, river, rock, sappong, scenic, sea, shadow, speleology, stalactite, stalagmite, stone, sun, thailand, tourism, travel, tunnel, underground, wall, water,