Canada's Waterscape: Two Million Lakes and Mighty Rivers

Canada holds ~60% of the world's lakes—over two million covering 7.6% of its land area—and a river network draining to three oceans. Key highlights:

Great Lakes (Shared with U.S.)

• Lake Superior – Largest freshwater lake by surface area (82,100 km²).
• Lake Huron – 3rd largest (59,600 km²); includes Georgian Bay.
• Lake Erie – 11th largest (25,700 km²); shallowest, warmest.
• Lake Ontario – 14th largest (19,000 km²); outlet to St. Lawrence.

Major Interior Lakes

• Great Bear Lake (31,000 km²) – Largest entirely in Canada; pristine, trout-rich.
• Great Slave Lake (27,200 km²) – Deepest in North America (614 m).
• Lake Winnipeg (24,400 km²) – 33rd globally; massive watershed, algae challenges.

Principal Rivers

• St. Lawrence (3,058 km) – Great Lakes outflow; Seaway commerce.
• Mackenzie (4,241 km) – Longest in Canada; drains 1.8M km² to Arctic.
• Nelson (2,575 km) – Lake Winnipeg → Hudson Bay; heavily hydro-developed.
• Fraser (1,375 km) – BC's lifeline; salmon, floodplain agriculture.
• Yukon (3,185 km) – North to Bering Sea; Klondike gold history.

Ecological Role

These waters support boreal carbon storage, Indigenous livelihoods, hydropower (60% of electricity), shipping, and globally significant wetlands. Climate change—permafrost thaw, altered flow regimes—poses existential threats.