Lake Akkeshi

 is a brackish lake near Akkeshi in Hokkaidō, Japan. The wetlands of Lake Akkeshi and have been designated a Ramsar site.
Wetlands.
Lake Akkeshi, deep at its deepest point, is fed by the and adjoins Akkeshi Bay. It is surrounded by salt marsh, fens, and bogs.
Birds.
Since a part of this lake does not freeze, whooper swans and ducks winter there. The white-tailed eagle and Steller's sea eagle also visit. There is a 381ha Japanese crane sanctuary.
Sustainable use.
Fishing and the aquaculture of oysters and clams occur in the lake.