Ключевые слова: adventure, asia, asian, boat, busuanga, cave, cavern, coron, dark, excursion, formation, geological, geology, grotto, island, kayangan, lake, landmark, landscape, limestone, mountain, national, nature, palawan, park, philippines, princesa, puerto, river, rock, sabang, scenery, site, speleology, stalactites, stalagmite, subterranean, tour, tourism, tourist, travel, tropical, underground, water, world,