A notable feature of Alexander Island is Hodgson Lake. It is a former subglacial lake that has come out from under an ice sheet that covered it. It is 2 km (1.2 mi) long by 1.5 km (0.93 mi). It has a 93.4 m (306 ft) deep water column that is sealed beneath 3.6 to 4.0 m (12 to 13 ft) thick lake ice.