The central basin receives an average of 6 inches (150 mm) of rain per year, with the surrounding mountains receiving an average of 15 inches (380 mm) per year.
The center of the basin is flat and contains Malheur and Harney lakes, which receive the streams originating within the basin in the surrounding mountains, including the Silvies River from the north and the Donner und Blitzen River from the south.
Harney Lake is the actual sink of the basin, connected in some years to Malheur Lake but currently separated by constantly changing sand dunes.
Both lakes cycle between open water in wetter years and marshes in drier years.
 The wetlands around Malheur Lake and Harney Lake form a wetlands oasis in the basin, providing a habitat for many migratory bird species, including 2.5 million ducks each year.
Malheur Lake and its surroundings are embraced by Malheur National Wildlife Refuge.

Harney County, Oregon, had a total population of 7,422 at the 2010 census, and Burns in the plain north of Malheur Lake is the only community with a population larger than 1,000.
Dryland ranching is the basis of the area's economy, with relatively little irrigation water available from the streams that enter Malheur Lake.
The central basin receives an average of 6 inches (150 mm) of rain per year, with the surrounding mountains receiving an average of 15 inches (380 mm) per year. The center of the basin is flat and contains Malheur and Harney lakes, which receive the streams originating within the basin in the surrounding mountains, including the Silvies River from the north and the Donner und Blitzen River from the south. Harney Lake is the actual sink of the basin, connected in some years to Malheur Lake but currently separated by constantly changing sand dunes. Both lakes cycle between open water in wetter years and marshes in drier years.  The wetlands around Malheur Lake and Harney Lake form a wetlands oasis in the basin, providing a habitat for many migratory bird species, including 2.5 million ducks each year. Malheur Lake and its surroundings are embraced by Malheur National Wildlife Refuge.
Harney County, Oregon, had a total population of 7,422 at the 2010 census, and Burns in the plain north of Malheur Lake is the only community with a population larger than 1,000. Dryland ranching is the basis of the area's economy, with relatively little irrigation water available from the streams that enter Malheur Lake.
Harney Basin