Country/territory: Japan
Central coordinates (latitude / longitude): 43°23'59"N (43.4000°) / 141°49'59"E (141.8333°)
Area (reported): 19,000 hectares / 190.00 km² / 46,950 acres / 73.36 square miles
Area (GIS-derived): 20,931 hectares / 209.31 km² / 51,722 acres / 80.82 square miles
Altitude: 10–15 m (33–49 ft)