The Great Basin is endorheic. An endorheic basin is a drainage basin with no outflow to an external body of water. The water collects in lakes and swamps, and much of it evaporates, leaving behind various salts and minerals. The Great Salt Lake would be considered an endorheic lake. The lake pictured above is Lake Abert, in South Central Oregon. The Great Basin encompasses most of Nevada, Eastern California, South Central Oregon, a small portion of Idaho and Wyoming, and half of Utah.