Geological Chronicle
Rima Jansen is a lunar graben structure spanning 45.12 kilometers in length across the lunar basalt crust. Formed by structural faulting and crustal extension, the trench cuts through terrain within the Julius Caesar quadrangle (LAC-60).
Officially cataloged by the International Astronomical Union at selenographic coordinates 14.4951° latitude and 29.5115° longitude, the rille designation notes: Named from nearby crater.