The rim of Malapert forms an irregular ring of peaks around the interior floor. The western side of the rim is overlaid by what appear to be impact craters. There are also small craters overlaying the southeastern rim. Much of the interior and details of the rim remain hidden by shadows.
The southwestern part of the rim forms part of a 5-km-high rise in the surface that has been unofficially-designated Malapert Mountain. This ridge appears wider along a line running roughly east-west, although details of the back side are hidden by shadows. The peak of this ridge lies almost exactly along 0° longitude, and it has the unusual attribute of always lying within sight of the Earth, as well as the Shackleton crater at the south pole.
Due to the location of Malapert Mountain, it has been proposed as the site of a transmitter for an expedition to the south lunar pole. The back side of this ridge also lies within the radio shadow of the Earth, and it has been suggested as a site for a radio telescope because the radio noise from our planet would be blocked.
|A||80.4° S||3.4° W||24 km|
|B||79.1° S||2.4° W||37 km|
|C||81.5° S||10.5° E||40 km|
|E||84.3° S||21.2° E||17 km|
|F||81.5° S||14.9° E||11 km|
|K||78.8° S||6.8° E||36 km|