Lake Akkeshi
Coordinates: 43°03′N 144°54′E / 43.050°N 144.900°E
Akkeshi-ko (厚岸湖?) is a brackish lake near Akkeshi in Hokkaidō, Japan. The wetlands of Lake Akkeshi and Bekanbeushi Marsh (別寒辺牛湿原?) have been designated a Ramsar Site.
Lake Akkeshi, 11m deep at its deepest point, is fed by the Bekanbeushi River (別寒辺牛川?) and adjoins Akkeshi Bay. It is surrounded by salt marsh, fens, and bogs.
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