Country/territory: Japan
Central coordinates (latitude / longitude): 43°04'59"N (43.0833°) / 144°52'59"E (144.8833°)
Area (reported): 20,000 hectares / 200.00 km² / 49,421 acres / 77.22 square miles
Area (GIS-derived): 18,567 hectares / 185.67 km² / 45,880 acres / 71.69 square miles
Altitude: 0–10 m (0–33 ft)