Biwako Kokutei Kōen (琵琶湖国定公園) is a Quasi-National Park in Shiga Prefecture and Kyoto Prefecture, Japan.

[1][2] It was founded on 24 July 1950 and has an area of 976.7 km2 (377 sq mi).

[3] In June 1993 an area of 65,984 ha beside Lake Biwa was designated a Ramsar Site and wetland of international importance.

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