In Omuroyama Volcano Geosite, visitors can enjoy the landforms of Omuroyama Volcano (designated by the government as national natural monument), which is the largest scoria cone among the volcanoes of Izu Tobu Volcano Group formed about 4,000 years ago, and the diverse landforms created by the volcano, which are visible from the top of the mountain.
Here visitors can see that volcanic ash emitted during the eruption of Tenjyozan Volcano located on Kozushima, one of the Izu Islands, which occurred in 838 A.D., covered Omuroyama Volcano and accumulated here. The white horizontal lines of volcanic ash that came from Kozushima engrained into the black strata of a small cliff by the road are a truly amazing sight.
Omuroyama Volcano is the largest scoria cone among the volcanoes of Izu Tobu Volcano Group shaped like an upturned bowl. This shape and the landform have been carefully preserved by the community with a traditional event of "Burning the mountain" that has been held by generation after generation for over 700 years. The whole of the mountain has been designated by the government as a national natural monument and at present it is prohibited to climb it by foot.