Geological Chronicle
Rimae Arzachel is a lunar graben structure spanning 57 kilometers in length across the lunar basalt crust. Formed by structural faulting and crustal extension, the trench cuts through terrain within the Purbach quadrangle (LAC-95).
Officially cataloged by the International Astronomical Union at selenographic coordinates -18.3077° latitude and -1.3832° longitude, the rille designation notes: Within crater.