Langrenus 8.9°S, 61.1°E

Langrenus is a very large and striking complex crater in the southwestern quadrant of the Moon. It has a diameter of 127 km, with 2.7 km-high, terraced inner crater walls, central peaks and a hilly crater floor. Under low solar illumination, the floor of the crater appears to have yellowish-brownish tints, in comparison with the neutral grey of the crater's surroundings. Langrenus has two conspicuous central peaks, which on old Moon maps were designated Langrenus alpha (the southern) and Langrenus beta. The southern crater wall is shaped rather like a triangular cape, and below it lie the craters Langrenus O and E, and Lohse (42 km, 13.7°S, 60.2°E).

Petavius 25.1°S, 60.4°E

Petavius is a giant complex crater with a diameter of 190 km. The inner crater walls are terraced and tower almost 3.3 km above the crater floor. Fairly central lies a large central, mountainous massif (south of which is the craterlet Petavius A).

On the floor of Petavius, a fracture zone (the main rille of Rimae Petavius) runs through the central massif. An additional segment begins on the western side of the central massif and runs farther west to the inner crater wall, and from there – less distinct – in both north and south directions, thus following the crater wall. These clefts and faults, together with the dark patches on the floor of the crater, indicate post-volcanic activity, long after the actual impact event.