Cavalerius is a prominent lunar impact crater that lies on the western edge of the Oceanus Procellarum lunar mare on the west part of the visible Moon.

The rim of Cavalerius is relatively high, rising to over 3 kilometers in places.

The interior floor has mixed low hills and level areas.

In the midpoint of the crater floor is a low central peak, with neighboring ridges to the north and east.

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