Ключевые слова: adventure, ancient, asia, blue, cave, cavern, caving, dark, deep, entrance, exploration, formation, geologic, geological, geology, hole, inside, lake, lamp, landmark, landscape, light, limestone, mountain, mysterious, national, natural, nature, new, palawan, park, philippines, princesa, puerto, rock, site, south, stalagmite, stone, subterranean, tourism, tourist, travel, tree, tropical, underground, wall, water, world,