Geosite List Home Geosite Jigoku-no-Kama Cave Jigoku-no-Kama Cave A huge hole in a rhyolitic pyroclastic rock in the Kii Oshima area. It is thought that the ceiling of a wave-erosion cave made of igneous rock had fallen down. The bottom of the cave is connected to the ocean. Map Jigoku-no-Kama Cave 33.4521913,135.8294772,14 See in the map app