Geological Chronicle
Rima Reiko is a lunar graben structure spanning 4.29 kilometers in length across the lunar basalt crust. Formed by structural faulting and crustal extension, the trench cuts through terrain within the Mare Serenitatis quadrangle (LAC-42).
Officially cataloged by the International Astronomical Union at selenographic coordinates 18.5524° latitude and 27.7106° longitude, the rille designation notes: Japanese female name.