Geological Chronicle
Rima Billy is a lunar graben structure spanning 69.82 kilometers in length across the lunar basalt crust. Formed by structural faulting and crustal extension, the trench cuts through terrain within the Letronne quadrangle (LAC-75).
Officially cataloged by the International Astronomical Union at selenographic coordinates -14.7407° latitude and -48.0407° longitude, the rille designation notes: Named from nearby crater.