Capuanus is a lunar impact crater that lies along the southern edge of the Palus Epidemiarum.

The interior floor has been resurfaced by basaltic lava, which is connected to the surrounding lunar mare by a narrow, crater-formed gap in the northern rim.

The rim reaches its maximum altitude along the western face, where it merges with ridges along the edge of the mare.

To the north of Capuanus is the western extreme of the wide rille named Rima Hesiodus, which runs to the east-northeast.

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