Campanus est un cratère de 48 Km et profond de 2080 m situé entre Mare Nubium et  Palus Epidemiarum. Il est au Nord-ouest du cratère Mercator (47 Km, 1760m), séparé de ce dernier par une rainure. Les Murailles de Campanus sont élevées et disposées en terrasses. Le fond plat est rempli de lave avec une petite montagne centrale. On note la présence de craterlets dans la partie Nord. Au sud est, on trouve Rupes Mercator qui est tangentiel avec le mur Nord-est externe du cratère Mercator. La muraille de Mercator est légèrement érodée, et plusieurs craterlets minuscules se trouvent sur les murs occidentaux et orientaux. Le plancher intérieur a été inondé par la lave, laissant une surface relativement douce et sans particularité.

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Campanus is a lunar impact crater that is located on the southwestern edge of Mare Nubium. It forms a crater pair with Mercator crater just to the southeast. Along the southern rampart of Campanus is the small lunar mare named Palus Epidemiarum. To the southwest is the small Dunthorne crater.

The rim of Campanus is roughly circular, with an outward bulge along the western rim and an inward bulge to the north-northwest. The outer wall has not been significantly eroded, although it has a low saddle-point along the south. The interior floor has been resurfaced by basaltic-lava, leaving only a small central peak projecting above the surface. The floor has the same low albedo as the nearby mare, giving it a dark appearance. It is marked by a pair of tiny craterlets near the northeast and northwest interior walls. A slender rille crosses the crater floor from north to south, passing to the east of the central peak.

To the west of Campanus crater is the rille system named Rimae Hippalus. Another rille system lies to the south, designated Rimae Ramsden.