The largest desert in the Great Basin is the Great Basin Desert.

The Great Basin Desert is the largest desert within the Great Basin, covering much of Nevada and extending into parts of Utah, Oregon, and California. Unlike other major deserts like the Mojave or Sonoran, the Great Basin Desert is classified as an endorheic desert, meaning it does not have any rivers that flow into the ocean. Instead, its waters either evaporate or collect in salt flats and dry lake beds. The desert features arid conditions, rocky landscapes, and significant temperature fluctuations, with hot summers and cold winters, making it a unique part of the Great Basin ecosystem.