Steinheil est un cratère de 68 Km et profond de 3000 m situé au Sud-est de Janssen (190 Km). Il écrase la le mur nordique du cratère plus ancien Watt (66 Km, 3000 m). Steinheil a des murs intérieurs très escarpés qui descendent vers un fond plat parsemé de craterlets, surtout dans la partie nordique. Le plancher est inondé par la lave, au contraire de celui de Watt qui est tourmenté par la présence de monticules et crevasses.

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Steinheil is a lunar impact crater that is located in the rugged highlands in the southeastern part of the Moon. It forms a prominent crater pair with the similar-sized Watt crater, which it partly overlays to the southeast. To the northwest is the large Janssen walled-plain. Due to the location of this crater, it appears foreshortened when viewed from the Earth.
This is a relatively circular crater that has undergone some light erosion from subsequent impacts. The inner wall is wider along the southwestern rim than elsewhere, and there is a slight outward bulge in the western rim. There are a few tiny craterlets along the rim and inner wall, the most notable being a crater at the base of the inner noirtheast rim. The interior floor is level, with no central peak and only a few minor craterlets.