Konuma Pond

About Konuma Pond

The lake south of Onuma, formed in the same way when lava from Mt. Komagatake's 1640 eruption dammed the rivers. Like Onuma, it is dotted with small islets called nagareyama. It was designated a Ramsar Site in 2012 together with Onuma and Junsainuma. The 1991 survey recorded carp, Japanese smelt and crucian carp, and tufted ducks and whooper swans in winter.

Sources: Ministry of the Environment, Ramsar Site leaflet: Onuma, Environment Agency of Japan, Lake Survey Report (1993), Environment Agency of Japan, Lake Survey Report: Data Appendix (1993) (sources in Japanese)

Lake data

Area

3.81 km²#20 in Hokkaido

Maximum depth

4.4 m#46 in Hokkaido

Average depth

2.1 m

Surface elevation

129 m

Transparency

1.5 m#30 in Hokkaidoas of the 1991 survey

Origin

Dammed lake

Lake type

Eutrophic

Fresh or brackish

Freshwater

Freezing

Freezes in winter

Unmodified lake

No

Natural park

Onuma Quasi-National Park

Ramsar Convention

Ramsar Site

Lake number

1250number in the national lake survey

Sources: Geospatial Information Authority of Japan, Area Statistics of Prefectures and Municipalities 2026 (as of July 1), Geospatial Information Authority of Japan, Lake Survey (surveyed 1983), Environment Agency of Japan, 4th National Survey on the Natural Environment: Lake Survey Report (1993). Area and depth use newer figures from the Geospatial Information Authority of Japan where available. Origin, lake type, transparency, freezing and unmodified status are as of the 1991 survey.

Themes that include Konuma Pond

• Dammed lakes
• Eutrophic lakes
• Freshwater lakes