Creeks and springs from the northwest Onaqui Mountains also feed the southeast valley region.

Skull Valley trends north-south but narrows slightly northeast towards Stansbury Bay; the Lakeside Mountains at Delle, and the northwest Stansbury Mountains at Timpie from the narrowing of the valley; Skull Valley and sections of the mountain ranges form the Great Salt Lake's southwest border.

Bordering southwest here, is a southeast trending 16 mi[1] long ridgeline from the west perimeter Cedar Mountains, which separates the Dugway Proving Grounds and the Great Salt Lake Desert region from the southwest Skull Valley.

A dissected region of sinks and flood land from neighboring washes and creeks form this valley center; this dissected flood land area is about four miles wide at its widest southwest of Iosepa, and extends seven miles[1] northwards towards the beginning of areas of salt flats, associated with the Great Salt Lake.

Media related to Skull Valley (Utah) at Wikimedia Commons