Area 25 is the largest named area in the Nevada National Security Site at 254 square miles (660 km2),[1] and has its own direct access from Route 95.[1] Area 25 is commonly called "Jackass Flats" because it is composed primarily of a shallow alluvial basin by that name.[1]
It was originally known as "Area 400",[2] and was renamed "Area 25" circa 1970.
No nuclear explosions took place within Area 25.[3]