Sulpicius Gallus is a small, bowl-shaped lunar crater that lies near the southwest edge of the Mare Serenitatis. About 10 kilometers to the south and east is the Montes Haemus range that forms the edge of the mare. This crater has a relatively high albedo, with a sharp-edged rim that displays little appearance of wear. There is a small rise at the mid-point.

To the northwest is a rille system designated the Rimae Sulpicious Gallus. These extend to the northwest for a distance of about 90 kilometers, curving and branching out to follow the edge of the mare.

Satellite craters

By convention these features are identified on Lunar maps by placing the letter on the side of the crater mid-point that is closest to Sulpicius Gallus crater.