Ключевые слова: asia, asian, backgrounds, basement, bay, east asian culture, exploration, geology, grotto basement, halong, halong bay, hanoi, holidays, horizontal, indochina, international landmark, landscape scenery, limestone, local landmark, long, long bay, mountain, natural landmark, natural parkland, nature, rock, rock object, scenics nature, sea, southeast, spelunking, stalactite, stone material, surprise, tourism, tourist, tradition, travel, travel destinations, tunnel, vacations, vietnam, vietnamese culture, water,