How large is Area 51 / the NTTR ?

The restricted airspace around Area 51 covers a rectangle of 23 x 25 miles, with Groom Lake in its center. That is an area of 575 square miles, commonly referred to as the Box or the Container by military pilots. Not even they are allowed to enter that air space. The coordinates of the no-fly zone are:

The entire Nevada Test and Training Range (NTTR), including Area 51, the Tonopah Test Range (TTR), the Nevada National Security Site (NNSS) and the bombing and gunnery ranges covers an area of 5,200 square miles north of Las Vegas. The NNSS alone covers about 1,600 square miles, partially contaminated with radiation from nuclear tests.