Réaumur (crater)

Réaumur is the remains of a lunar crater located on the southern edge of Sinus Medii. It shares and eroded rim with the similar crater Oppolzer to the northwest. It lies to the northwest of the large walled plain Hipparchus, and east of Flammarion. To the south is Gyldén, and farther to the south-southwest is Ptolemaeus.

The rim of Réaumur is heavily eroded, and the northern half consists of little more than a series of low ridges in the mare. The southern rim is notched and indented by small crater impacts. The interior floor is relatively smooth and flat with no significant features.

The broken northern rim intersects a rille designated Rima Oppolzer. This feature is about 110 kilometers long and follows a course from the north-northeast to the south-southwest. To the east of the crater rim is a smaller rille designated Rima Réaumur. Farther to the east is the small Seeliger.