StarCo by Ludo Coppens © 2014-
Select a rima by clicking on the name. Move the mouse over the full scale image of the larger region to show names of prominent surface features and additional data: depth from rim to crater floor and diameter, taken from the Times Atlas of the Moon (Ed. H.A.G. Lewis, Times Newspapers Ltd., 1969; charts available online at http://www.lpi.usra.edu/resources/mapcatalog/LAC/) and from Virtual Moon Atlas (Christian Legrand & Patrick Chevalley).
A rima (GER, ENG: rille) is a long (up to hundreds of km) and rather narrow (up to a few km) depression or fissure in the lunar surface. Straight (possibly grabens, tectonic depressions between parallel faults), sinuous (meandering; possibly collapse lava tubes) or arcuate (around inner edges of maria; probably due to shrinking of cooling lava of cooling lava ).
(At right: oblique view from Rima Ariadaeus I, taken from lunar orbit; © NASA)