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.
Canada
Since the end of the last glacial period, Canada has consisted of eight distinct forest regions, including extensive boreal forest on the Canadian Shield. Canada has over 2,000,000 lakes—563 greater than —which is more than any other country, containing much of the world's fresh water.
There are also fresh-water glaciers in the Canadian Rockies and the Coast Mountains.
Canada is geologically active, having many earthquakes and potentially active volcanoes, notably Mount Meager massif, Mount Garibaldi, Mount Cayley massif, and the Mount Edziza volcanic complex. The volcanic eruption of the Tseax Cone in 1775 was among Canada's worst natural disasters, killing an estimated 2,000 Nisga'a people and destroying their village in the Nass River valley of northern British Columbia. The eruption produced a lava flow, and, according to Nisga'a legend, blocked the flow of the Nass River.