Ключевые слова: asia, backdrop, background, bay, beautiful, cave, cavern, color, deposits, elegance, erosion, exploration, formations, geology, grotto, ha long, halong, irregular, landmark, light, limestone, minerals, natural, nature, rock, science, sculpted, shadows, shape, speleology, stalactite, stalactites, stalagmite, stalagmites, structure, tourism, vietnam,