Dolphin and Union Strait

Dolphin and Union Strait lies in both the Northwest Territories and Nunavut, Canada, between the mainland and Victoria Island. It links Amundsen Gulf, lying to the northwest, with Coronation Gulf, lying to the southeast. The southeastern end of the strait is marked by Austin Bay. It gets its name from the two boats used by John Richardson (naturalist) who first explored it in 1826.

The Inuit who use this area have been variously known as the Copper Inuit, the Copper Eskimos, or the "People at the end of the world," because few other aboriginal groups had continuously used the area before. This is partly why the first explorers who ventured into this awe-inspiring, lethally-formidable landscape, were amazed by the "blond" Inuit they had encountered.

There are several islands within the strait, including the Liston and Sutton Islands, historically home to the Noahonirmiut band of Copper Inuit.

The strait is about 161 km (100 mi) long and ranges from 32 to 64 km (20 to 40 mi) in width. When frozen, it is used by Barren-ground caribou, known the Dolphin and Union herd, to reach Victoria Island for the summer and to return to the mainland for the winter. Eider ducks are also found in the strait.