The massif extends between Goodge Col and Branscomb Glacier to the northwest, Nimitz Glacier and Gildea Glacier to the southwest and south, Dater Glacier and its tributary Hinkley Glacier to the east. The southeastern part of the massif ends at Hammer Col, which joins it to the Craddock Massif, of which the highest point is Mount Rutford (4,477 metres / 14,688 feet). The massif comprises both the high central Vinson Plateau with its few peaks rising to over 4,700 metres (15,400 ft), and several side ridges mostly trending southwest or northeast from the plateau.
The current height (4,892 m/16,050 ft) resulted from a GPS survey by the 2004 Omega Foundation team comprising Damien Gildea of Australia (leader) and Rodrigo Fica and Camilo Rada of Chile. Since 1998 and continuing through 2007, the Omega Foundation has placed a GPS receiver on the summit for a suitable period of time to obtain accurate satellite readings.