Junsainuma Pond

About Junsainuma Pond

A pond west of Onuma and Konuma, a volcanic dammed lake formed by Mt. Komagatake's eruption like Onuma. It was designated a Ramsar Site in 2012 together with Onuma and Konuma. True to its name, the 1991 survey recorded water shield (junsai), along with pond lilies, pondweed and water chestnut, and carp, Japanese smelt and crucian carp.

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

Lake data

Area

0.73 km²#37 in Hokkaido

Maximum depth

5.4 m#35 in Hokkaido

Average depth

4.5 m

Surface elevation

155 m

Transparency

1.7 m#26 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

1240number in the national lake survey

Sources: 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 Junsainuma Pond

• Dammed lakes
• Eutrophic lakes
• Freshwater lakes