The Pacific Ocean watershed drains Canada west of the Rocky Mountains. Three major rivers flow into the Pacific along the length of this watershed: the Fraser, the Columbia and the Yukon.
The largest Canadian river that flows to the Pacific and North America's longest undammed river, the Fraser drains a watershed extensive enough to cover one-quarter of British Columbia. From its headwaters in the Rocky Mountains near Jasper, Alta., the Fraser flows for about 1,370 kilometres before discharging into the Strait of Georgia near Vancouver. The Fraser's watershed is a major spawning ground for wild sockeye and chinook salmon, composing the majority of stocks in Canada.
The Columbia River is another major tributary of the Pacific Ocean watershed in North America. Born in Canada's Rockies, the Columbia meets the sea in Astoria, Oregon, and drains an area that covers parts of British Columbia, Washington, Oregon, Idaho, Montana, Wyoming, Nevada and Utah. This river channels more water into the Pacific than any other in North and South America, according to the U.S Geological Survey.
Like the Columbia, the Yukon River begins on Canadian soil and flows into the United States. The first third of the Yukon lies in Canada. After draining much of Alaska, it empties into the Yukon-Kuskokwim Delta on the Bering Sea.