Upper Klamath Lake (sometimes called
Klamath Lake) (
Klamath:
?ews, "lake" ) is a large, shallow
freshwater lake east of the
Cascade Range in south-central
Oregon in the
United States. The largest body of fresh water by surface area in Oregon, it is approximately long and wide and extends northwest from the city of
Klamath Falls. It sits at an average elevation of .