Sannomiya Gorge
"This gorge is in eastern Kobayashi City. It is one of the geosites of ""Kirishima Geopark."" It was formed by the pyroclastic flow of a huge eruption that occurred about 340,000 years ago, and you can enjoy magnificent natural sites such as ""Yagura no Todoro"" and ""Senjoiwa."" The promenade, which was once used as a a trolley road, is characterized by its 11 tunnels of different sizes, and it has been chosen as one of Japan's Promenade 100 Selections."