The island is long and wide, with its highest elevation above
sea level. On the southern end of Dorset Island, at an elevation of above sea level, is Cape Dorset (), which projects into the Hudson Strait. It is part of the
Kingnait Range (
Kingnait, in
Inuktitut, means "high mountains"). The cape represents the southern tip of the Foxe Peninsula. On September 24, 1631, Captain
Luke Foxe named the landform "Cape Dorset" to honour his benefactor,
Edward Sackville, 4th Earl of Dorset. Kingnait Hill, at high, is located on the island's north-west side. The shorter Eegatuak Hill is located north of the cape, on its eastern side, rising above sea level, and exhibiting a distinctive bowl-shape surmounted by a
cairn.
Mallik Island (Mallikjuaq Island), directly to the north, is joined to Dorset Island by sand and boulders. A natural harbour exists in the peninsula formed by the southeast side of Mallik Island and the northwest side of Dorset Island with prevailing northwesterly winds at knots, stronger in September and October. The anchorage may have heavy swell conditions and there is frequent fog during the navigation season of early August through mid-October. Ice break-up is around mid-July, and freeze-up occurs in early November. Winter ice thickness can be up to . There are several other islands within , including
Ukaliqtuuq and
Saqajaa. ==History==