Ключевые слова: abstract, beautiful, bright, cave, cavern, caving, dark, deep, entrance, exploration, geologic, geological, geology, inside, interior, landscape, light, limestone, lod, mae hong son, mountain, mysterious, natural, nature, river, rock, sappong, scenic, shadow, speleology, stalactite, stalagmite, stone, thailand, tourism, travel, tunnel, underground, vacation, wall, water,