Fermi is a large lunar impact crater of the category named a walled plain.

The most notable aspect of Fermi is that the large and prominent crater Tsiolkovskiy intrudes into its southeastern rim.

Unlike Tsiolkovskiy, however, the interior of Fermi is not covered by dark basaltic lava, and so it is barely distinguishable from the surrounding rugged and battered terrain.

This formation has been significantly eroded and damaged by subsequent impacts, and several notable craters lie across the rim and within the basin.

Prior to formal naming in 1970 by the IAU,[2] the crater was known as Basin V.[3] The following are L&PI topographic maps that show portions of Fermi.