Stadius is a ghostly remnant of an ancient lunar impact crater that has been nearly obliterated by basaltic lava flows.

To the northwest is a chain of craters that continue in a roughly linear formation until reaching Mare Imbrium.

Only the northwestern rim of Stadius remains nearly intact, and it joins with a north-running ridge line that reaches the western rampart of Eratosthenes.

The remainder of the formation forms a ghostly trace of the original rim, created from a few rises in the surface, and there is no indication of a central peak.

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