The Quinn River is the largest river in the region, starting in the Santa Rosa Range and ending in the Quinn River Sink on the playa south of the Black Rock Range. The watershed covers 11,600 sq mi (30,000 km2)[1] including the Upper and Lower Quinn River, Smoke Creek Desert, Massacre Lake, and Thousand Creek[3]/Virgin Valley[4] watersheds of northwestern Nevada as well as small parts across the borders of California and Oregon.