Geosite List Home Geosite The Sasabigawa-keikoku Ravine The Sasabigawa-keikoku Ravine The Otonashi-gawa accretionary prism can be seen among this ravine. You can see the fracture zones caused by the thrust (low-angled reverse fault) and submarine fan sediments that was formed under the ocean back then. Map The Sasabigawa-keikoku Ravine 33.8720747,135.8159507,14 See in the map app