Malheur National Wildlife Refuge Professional Review and Guide
"Highlights include one of the oldest, largest, and most productive federal wildlife refuges in the United States, and the ultimate collecting pool for the vast, internally drained Harney Basin, which is the Oregon segment of the Great Basin. The Fish and Wildlife Service has some wonderful exhibits at Refuge Headquarters, mostly of stuffed birds, but they teach little about the geology of the two immense lakes that essentially make up the refuge.
To understand the lakes’ geological significance, you need to know that Harney Basin, covering one-fifth of Oregon, is part of the Great Basin, which occupies most of Nevada and parts of Oregon, Utah, and Idaho. As with the rest of the Great Basin, the Harney Basin has no external water drainage to the ocean (although the Owyhee River, which flows into the Snake River, cuts across the basin)."