Geosite List Home Geosite The Umikongo Rocks The Umikongo Rocks The cliffs that continue from Kashino-zaki Point to Taka-no-su in the Kii Oshima are made of firm rhyolite where you can observe steady cracks along the precipices. Many rocks made by these cracks stand close together at the Umikongo. Map The Umikongo Rocks 33.4631294,135.854179,14 See in the map app