Malheur Lake is a lake in an arid region of eastern Oregon, United States near Burns, Oregon. The lake is fed by Donner und Blitzen River from the south and the Silvies River from the north. Malheur Lake has no outlet, though water escapes through ground seepage and by evaporation; widespread regional irrigation may or may not have an effect. At the bottom of Harney Basin, also Harney Lake is a "twin" which, historically, merges with Malheur Lake when the water levels rise sufficiently. This last happened in the mid-1980s.