Yangoor is the largest known crater on the surface of the Uranian moon Ariel. The name comes from a spirit that brings day in Australian Aboriginal mythology. It is about 80 km in diameter and is located approximately 450 km from Ariel's south pole. The northwestern edge of the crater was erased by formation of ridged terrain. (wikipedia entry)
A crater is a circular depression likely created by an impact event. On Ariel they are named after light spirits (individual and class).
Sorry, there hasn't been a good map made for this world yet :(