Hudson Bay drainage basin
The Hudson Bay drainage basin is the drainage basin in northern North America where surface water empties into Hudson Bay and adjoining waters. Spanning an area of about , the basin is almost totally in Canada (spanning parts of the Prairies, central and northern Canada), with a small portion in the United States (in Montana, the Dakotas, and Minnesota). The watershed's headwaters are in part on the Continental Divide of the Americas, and the watershed's connection to the Labrador Sea is at the Hudson Strait's mouth between Resolution Island in the Qikiqtaaluk Region and Cape Chidley on the Labrador Peninsula. On the Continental Divide the basin is bounded at Triple Divide Peak to the south, and Snow Dome to the north.
Fauna of Canada
Canada's rivers are famous for their annual runs of Atlantic salmon on the east coast and Pacific salmon on the west coast. Canada's many freshwater lakes and streams are home to rainbow trout, Arctic char, and brook trout. In the past, invasive species such as the lamprey and zebra mussel have threatened these native species, and while efforts to combat them have been made they still remain a hazard in some areas, and there are ongoing effort to prevent the spread of Asian carp from the United States.
There are also significant commercial fisheries of many salt-water species, including Atlantic cod, haddock and halibut, although some of these are in decline.