Hassan is an impact crater on the southern hemisphere of Saturn's moon Enceladus. Hassan was first observed in Cassini images during that mission's March 2005 flyby of Enceladus. Numerous criss-crossing fractures cut across Hassan, breaking up the regolith on the crater floor. (wikipedia entry)
A crater is a circular depression likely created by an impact event. On Enceladus they are named after people and places from Burton's Arabian Nights.
Image Source. Marker locations are approximate and may not always appear to align with image on map.