This Geosite has narrow valleys that spread far into the land. Since ancient times, people living in this area have intermingled beyond the valleys.
（1）Iwatsubo Pothole
This is a large pothole at the bottom of the Sunami River that runs near Iwatsubo Shrine in Iwatsubo, Tottori City. It is 8 meters in diameter and 1.6 meters in depth. From the area of this pothole, the riverbed of the Sunami River becomes steep.
（2）River Terraces of Nosaka River
River terraces are formed on the banks of the Nosaka River, a tributary of the Sendai River. Today there is a 7-meter-high terrace and a 13-metere-high terrace. The character for "terrace," "段," is used in the names of settlements on these river terraces.
（3）Azo Forest Park
In this forest park, there are accommodation facilities such as log cabins and a car camping site. There are tennis courts and skiing slopes near the park. The area of this park is identified in the regular star observation program by the Ministry of Environment as the darkest star observation point in Japan. (The darker the place, the better for the observation of stars.)
Iwatsubo Fault
This is a strike slip-fault that runs from Kamisunami (in the southern part of Tottori City) to Iwatsubo and then to Kouchi, Shikano Town.
