Geological Chronicle
Rimae Grimaldi is a lunar graben structure spanning 162 kilometers in length across the lunar basalt crust. Formed by structural faulting and crustal extension, the trench cuts through terrain within the Grimaldi quadrangle (LAC-74).
Officially cataloged by the International Astronomical Union at selenographic coordinates -6.1817° latitude and -63.8978° longitude, the rille designation notes: Named from nearby crater.