Cayley (crater)
 Cayley is a small lunar impact crater that is located in a lava-flooded region to the west of Mare Tranquillitatis. It lies to the northwest of the smaller crater De Morgan and the larger D'Arrest. West and slightly north of Cayley is Whewell a crater of about the same dimensions. To the north is a linear rille designated Rima Ariadaeus which follows a course to the east-southeast.This is a circular bowl-shaped formation with a small interior floor at the midpoint.