Baffin Bay, located between Baffin Island and the west coast of Greenland, is defined by the International Hydrographic Organization as a marginal sea of the Arctic Ocean. It is sometimes considered a sea of the North Atlantic Ocean. It is connected to the Atlantic via Davis Strait and the Labrador Sea. The narrower Nares Strait connects Baffin Bay with the Arctic Ocean. The bay is not navigable most of the year because of the ice cover and high density of floating ice and icebergs in the open areas. However, a polynya of about 80,000 km2 (31,000 sq mi), known as the North Water, opens in summer on the north near Smith Sound. Most of the aquatic life of the bay is concentrated near that region.

Baffin Island, in the Canadian territory of Nunavut, is the largest island in Canada, the second largest island in the Americas, and the fifth-largest island in the world. Its area is 507,451 km2 (195,928 sq mi) with a population density of 0.03/km2; the population was 13,039 according to the 2021 Canadian census; and it is located at 68°N 70°W. It also contains the city of Iqaluit, which is the capital of Nunavut.