Wanderlust World Wanderlust World The Great Lakes form the largest group of freshwater lakes on Earth, a natural wonder that shapes the geography, economy, and ecology of northeastern North America. Here are ten essential facts that highlight their significance.
Covering a combined surface area of 94,600 square miles (244,000 square kilometers), the Great Lakes are the planet's largest freshwater system by area.
Straddling the border between the United States and Canada, the lakes lie in the northeastern part of North America, touching eight U.S. states and the province of Ontario.
The system comprises five distinct lakes: Superior, Michigan, Huron, Erie, and Ontario. Together they hold about 20% of the world's surface fresh water.
Lake Superior is the deepest, plunging to 1,333 feet (406 meters) at its lowest point, making it the coldest and most oligotrophic of the five.
The lakes contain an estimated 6 quadrillion gallons (22 quadrillion liters) of water—roughly 20% of the global fresh water supply.
Over 1,000 species of fish inhabit these waters, supporting complex food webs and valuable commercial and recreational fisheries.
The lakes drive a massive regional economy, underpinning shipping, manufacturing, fishing, and a multi-billion-dollar tourism industry.
Decades of industrial and agricultural runoff have degraded water quality, but binational cleanup efforts like the Great Lakes Water Quality Agreement have led to significant recovery.
Rising temperatures are reducing ice cover, altering evaporation rates, and shifting ecosystems, posing long-term risks to water levels and native species.
For centuries, the lakes have served as a vital transportation artery, enabling the movement of goods, people, and ideas that shaped the development of both nations.