Rainier Mesa is one of four major nuclear test regions within the Nevada National Security Site (NNSS).[1] It occupies approximately 40 square miles (100 km2) along the northern edge of the NNSS and corresponds to Area 12.[1][2]
The Rainier Mesa area consists of both Rainier Mesa proper and the contiguous Aqueduct Mesa.[3]
At 7,680 feet (2,340 m), the top of Rainier Mesa is the highest elevation within the NNSS.[2]