Geological Chronicle
Delisle sits in the western part of Mare Imbrium, spanning 24.83 kilometers in diameter north of the crater Diophantus and northwest of the ridge Mons Delisle. Excavated into basaltic lava flows during the Eratosthenian period, the crater has not been significantly modified by subsequent processes, leaving its structure relatively fresh.
The rim displays a somewhat polygonal outline surrounded by a rampart and a skirt of hummocky terrain formed from impact ejecta. A low central rise rests on the floor, accompanied by slight slumping along the inner wall.
The surrounding plains are marked by sinuous channels, including the 150-kilometer Rima Diophantus to the south and Rima Delisle to the northeast. Johann H. Schröter included the feature in lunar nomenclature as "de l'Isle" in 1791, honoring French astronomer Joseph-Nicolas Delisle, before the International Astronomical Union officially adopted its modern designation in 1935.