Geosite List Home Geosite The River Terrace in Shimoayukawa The River Terrace in Shimoayukawa The Tonda-gawa River in Kamitonda Town winds gently through a lowland on an active fault zone. Though it is small in scale, you can see a typical river terrace among the right riverbank in an area called Shimoayukawa. Map The River Terrace in Shimoayukawa 33.7222516,135.4786348,14 See in the map app