To the southwest of Liebig is the slightly smaller crater de Gasparis.

The rim of Liebig has a low inner wall, with an interior floor that is nearly featureless except for a few tiny craterlets.

The small, cup-shaped crater Liebig A lies along the inner wall and part of the interior floor.

The western edge of the Mare Humorum is a fault line designated the Rupes Liebig, named after this crater.

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Liebig.