Focas is a small lunar impact crater that lies on the far side of the Moon, just past the southwestern limb.

These ranges form a double-ring around the Mare Orientale impact basin.

The crater is located toward the southern end of this immense feature, just to the north of the Montes Cordillera range.

This is a circular crater with an interior floor about half the total diameter.

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Focas.