The nutrient-rich cold waters found in the basin are known to be especially favourable to "phytoplankton and the numerous islands within it are important bird "habitats, including "Sabine's gulls and many types of "shorebirds. "Bowhead whales migrate to the northern part of the basin each summer.
The basin takes its name from the English explorer "Luke Foxe who entered the lower part in 1631.
Foxe Basin is a broad, predominantly shallow depression, generally less than 100 metres (330 ft) in depth, while to the south, depths of up to 400 metres (1,300 ft) occur. The tidal range decreases from 5 m (16 ft) in the southeast to less than 1 m (3 ft 3 in) in the northwest. During much of the year, landfast ice dominates in the north, while "pack ice prevails towards the south. Foxe Basin itself is rarely ice-free until September, open pack ice being common throughout the summer. Vigorous "tidal currents and strong winds keep the ice pack in constant motion and contribute to the numerous "polynyas and "shore leads which are found throughout the region. This same motion, combined with the high sediment content of the water makes the sea ice of Foxe Basin dark and rough, easily distinguishable from other ice in the "Canadian Arctic.
The terrain is rocky and rugged in the southern half of the region, and generally low-lying in the north. High "cliffs are found across the southern portion of the region, where most of the "seabirds nest. Coastal "marshes and "tidal flats up to 6.5 km (4.0 mi) in width are found in the vast lowland section of eastern Foxe Basin, as well as in the bays of "Southampton Island.
This is one of the little-known areas of the Canadian "Arctic, though it is proving to be biologically rich and diverse. The numerous polynyas in northern Foxe Basin support high densities of "bearded seals and the largest "walrus herd in Canada (over 6,000 individuals). "Ringed seal and "polar bear are common, with north Southampton Island as one of the highest-density polar bear denning areas in Canada.
This area is also an important summering area for the "bowhead whale, "beluga and "narwhal. Both bowhead whales and belugas winter in the waters of northeastern "Hudson Bay. Bowheads were the only known baleen whales to occur in the Hudson Bay, but recently some other species such as "humpback and "minke are confirmed to migrate into the waters as well.
The region is the main "North American stronghold of the Sabine's gull, with some 10,000 pairs nesting here. Moderate numbers of "black guillemots, "Arctic terns and "glaucous, "herring and "ivory "gulls also breed here. The "Great Plain of the Koukdjuak on Baffin Island is the world's largest "goose nesting colony, with upwards of 1.5 million birds, 75 percent of which are "lesser snow geese and the remainder "Canada and "brant geese. Shorebirds and "ducks are also abundant. Several hundred thousand "thick-billed murres breed on the cliffs of "Digges Sound and "Coats Island to the south.
This region is not yet represented in the national marine conservation areas system. Studies to identify preliminary representative marine areas have yet to be undertaken.