Geological Chronicle
Rima Réaumur is a lunar rille located near the southern edge of Sinus Medii at coordinates 2.84° S, 2.47° E. It has a length of 30.66 kilometers and lies within the Ptolemaeus quadrangle (LAC-77). The feature sits to the east of the rim of Réaumur crater, with the small crater Seeliger lying farther to the east.
To the northwest of Réaumur crater, the broken northern rim intersects Rima Oppolzer, a rille about 110 kilometers long that follows a course from north-northeast to south-southwest. Réaumur crater itself sits to the northwest of the large walled plain Hipparchus and east of Flammarion, with Gyldén to the south and Ptolemaeus farther to the south-southwest.
The rille derives its name from nearby Réaumur crater, a 51-kilometer impact formation named after the 18th century French scientist René de Réaumur