Longomontanus is an ancient lunar impact crater located in the rugged southern highlands to the southwest of Tycho crater. It is of the variety of large lunar formations sometimes called a "walled plain", although it is actually more of a circular depression in the surface. Because of its location, the Longomontanus appears distinctly oval in shape due to foreshortening.
To the southeast of Longomontanus is the even larger Clavius crater, and to the east is Maginus crater. North of the rim is the irregular Montanari crater, which in turn is joined at its northern rim by Wilhelm crater.
The wall of Longomontanus is heavily worn and incised by past impacts, and the rim is essentially level with the surrounding terrain. The northern rim especially is impacted with multiple overlapping craterlets. To the east of the rim is a semi-circular ridge that has the appearance of an overlapped crater rim. The crater floor of Longomontanus is relatively flat, with a low cluster of central peaks somewhat offset to the west.
Satellite craters
By convention these features are identified on Lunar maps by placing the letter on the side of the crater mid-point that is closest to Longomontanus crater.
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