Ключевые слова: 100 geological picks in japan, akiyoshi, akiyoshido cave, attractions, cave, chugoku area, earth science, earths core, geology, golden pillar, japan, karst, karst plateau, karst topography, landscape, lighting, limestone, mine city, minerals, natural stone, ore, outdoor, ramsar convention, rock, rock formations, rocky mountain, shuhocho, special natural monuments, stalactites, stalagmites, takian, tourism, tourist attractions, travel, underground, underground cave, yamaguchi, yamaguchi prefecture,