Poronuma Pond

About Poronuma Pond

A brackish, lagoon-origin lake on the Sea of Okhotsk coast in Sarufutsu Village. In the 1991 survey it ranked 11th in Japan among unmodified lakes with a shoreline of 5 km or more (6.0 km). Corbicula clams and freshwater mussels live here, and tundra swans were recorded in winter.

Sources: Environment Agency of Japan, Lake Survey Report (1993), Environment Agency of Japan, Lake Survey Report: Data Appendix (1993) (sources in Japanese)

Lake data

Area

1.97 km²#27 in Hokkaido

Maximum depth

2.3 m#69 in Hokkaido

Average depth

1.5 m

Surface elevation

0.18 m

Transparency

0.3 m#60 in Hokkaidoas of the 1991 survey

Origin

Lagoon-origin lake

Lake type

Dystrophic

Fresh or brackish

Brackish

Freezing

Freezes in winter

Unmodified lake

Yes (shore entirely natural)

Natural park

None

Lake number

0050number 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 1987), 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 Poronuma Pond

• Lagoon-origin lakes
• Dystrophic lakes
• Brackish lakes
• Unmodified lakes