Nevada contains the largest portion of the Great Basin, covering about 65% of the region.

The Great Basin spans parts of several western U.S. states, but Nevada holds the largest area within this watershed. The state's landscape is characterized by mountain ranges separated by desert valleys, making it a key geographical area in the Great Basin. Nevada's vast desert and semi-arid lands are integral to the region's unique climate and ecosystem, with its high deserts and low precipitation rates forming much of the Great Basin’s signature terrain.