Approximately 11 km (6.8 mi) separate the two islands. North Twin Island, 157 km2 (61 sq mi), 18.5 km (11.5 mi) by 11 km (6.8 mi), to the northwest, is the larger of the two. South Twin Island measures 12.8 km (8.0 mi) by 10.2 km (6.3 mi). Landscape characteristics include, unconsolidated sand, gravel, lakes, marshland, sand dunes, and wide tidal flats.[2]
Notable landmarks include Cotter Point on North Twin, and Lucy Point on South Twin.[3]
Flora
The habitat includes small stands of trees: dwarf birch, juniper, white spruce, and willows, along with heaths and shrubs.