Letronne 10.8°S, 42.5°W

Letronne is a semicircular relief feature, open to the north, and lying north of Gassendi. It is the remnant of a lava-flooded crater, 116 km across, and appears like a bay of Oceanus Procellarum. Morphologically, Letronne resembles the terrestrial, Chicxulub meteorite crater on the Yucatan peninsula in Mexico. A similar structure is the crater Le Monnier in Mare Serenitatis.

On the floor of Letronne three small mountain peaks (the remnants of the central mountain) are visible. Northwest of these lies a craterlet surrounded by a bright halo. Near the inner eastern wall lies Letronne B (5 km), which is also surrounded by a bright halo. The mare wrinkle-ridge system Dorsa Rubey (10.0°S, 42.0°W) runs north-south and ends inside Letronne at the remnants of the central mountain peak. The overall length of Dorsa Rubey amounts to about 100 km.

Wichmann 7.5°S, 38.1°W

Wichmann is a small, circular, and very bright crater, 10 km across. It lies at the southeastern end of a large semicircular formation, named Wichmann R, which is undoubtedly the remnants of the wall of a crater that has been completely flooded by lava from the south. South of Wichmann lies a small mountain and directly east of that the craterlet Scheele (formerly named Letronne D), which has a diameter of only 4 km.

Flamsteed 4.5°S, 44.3°W

A crater, 20 km in diameter. It lies near the southern section of the wall of the ghost crater Flamsteed P. Flamsteed P is a partially breached elliptical ring of mountain ridges, with a diameter of about 110 km.