Lehmann is a lunar

Moon

The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...

 impact crater

Impact crater

In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...

 attached to the northern rim of the much larger walled plain Schickard

Schickard (crater)

Schickard is a lunar impact crater of the form called a walled plain. It lies in the southwest sector of the Moon, near the lunar limb. As a result the crater appears oblong due to foreshortening. Attached to the northern rim is the lesser crater Lehmann, and to the northeast is the even smaller...

. To the northwest is the crater Lacroix

Lacroix (crater)

Lacroix is a crater that is located in the southwest part of the Moon, to the northwest of the large walled plain Schickard. The most notable feature of this crater is the smaller crater Lacroix J that overlies the southern rim. The surviving rim of Lacroix is nearly circular, with a slightly worn...

.

Lehmann is heavily worn with an irregular rim. A small double-crater overlays a portion of the northwest rim. The interior floor is nearly flat with groupings of tiny craterlets near the south and west edges. There is a gap in the southern rim which connects the floor to Schickard. A sinuous rille runs along the length of this valley.