Theophilus 11.4°S, 26.4°E

An impressive complex crater with a diameter of 110 km, which was created in the Eratosthenian period on the lunar timescale. The crater wall reaches a height of 4.4 km above the crater's floor and the huge, triple central peaks attain a height of 1.4 km above the floor. The crest of the rim is about 1.2 km above the surrounding terrain. Except for the western rim, the complete inner wall is marked by prominent terraces. At high magnifications they appear as linear, sectional landslips. The northwestern wall is broken by the small crater Theophilus B (8 km). The central peak is strongly split and has low foothills on the southern side. The crater floor appears smooth and flat and is filled with melted impact material, which is also emplaced right round outside the crater rim. In addition, large telescopes show a few crater pits on the floor.

Shortly after First Quarter, Theophilus appears bright and shows the beginnings of a ray system, which becomes more prominent with increasing solar altitude. About 100 km southeast lies Theophilus L, a small, circular crater 5 km in diameter, that has a halo of very dark material. It is a Dark Halo Crater.

Mädler 11.0°S, 29.8°E

Mädler is a very interesting crater, 27 km in diameter, lying east of Theophilus. It is the source of a very broad, fan shaped deposit of ejected material, which implies a grazing impact (as with Proclus). The fan extends in an easterly direction.