It has a distinctive glaciated landscape. The Glenshane Pass, part of the A6 Belfast to Derry road, is in the mountains and has notoriously bad weather in winter. Sawel Mountain is the highest peak in the Sperrins, and the seventh highest in Northern Ireland. Its summit rises to 678 m (2224 ft). Another of the Sperrins, Carntogher (464m), towers over the Glenshane Pass.
Geologically, the Sperrins are formed mostly from Precambrian metamorphic rocks, with some younger Ordovician igneous rocks in the southern flank of the range.