Atlas 46.7°N, 44.4°E

The crater Atlas, with a diameter of 87 km, is a conspicuous example of the class of Fractured Floor Craters (FFC). This is shown by an extensive system of rilles on the floor of the crater. Posidonius and Gassendi are other striking examples.

Atlas has strongly terraced, inner crater walls, which rise 3 km above the crater's floor. The tip of a central peak is visible and the floor of the crater is rough and fissured. The rille system, Rima Atlas, is of volcanic origin (as will all craters of this type), and under high illumination, at least two dark spots are visible on the crater floor (as in the crater Alphonsus). The dark spots probably consist of pyroclastic ash deposits and suggest volcanic activity occurred a long time after the actual impact.

Hercules

46.7°N, 39.1°E

Hercules has a diameter of 69 km and, like Atlas, displays terraced inner crater walls. In contrast to Atlas, however, the crater's floor is flat, smooth and shows – just visible – the tip of a central peak. In addition, the floor of the crater has been flooded by lava. Directly south of the central peak is Hercules G (13 km). A further small crater, Hercules E (9 km) breaches the southern crater wall. Atlas and Hercules form a striking pair of craters on the Moon's northeastern limb.