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Great Lakes
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Marquette Map showing the Great Lakes-Superior, Michigan, Huron, Erie, and Ontario-along with their surrounding drainage basin, depth variations indicated by shading, and major nearby cities in both the United States and Canada. State, provincial, and international boundaries are marked, and a small locator globe at the bottom left highlights the region's position in North America. Niagara Falls
The video thumbnail image shows two hands holding zebra and quagga mussels, superimposed above a clear body of water. White question marks appear in the upper left corner.
Two large cargo ships travel side by side through the Welland Canal, bordered by trees and industrial buildings in Ontario. Lake Michigan shoreline Map showing the St. Lawrence hydrographic system and the five main sectors of the St. Lawrence Seaway project, stretching from Lake Ontario near Kingston through various locks, canals, and dams along the Canada-United States border to Montreal. The map highlights key locations such as the Thousand Islands, International Rapids, Lake St. Francis, Soulanges, and Lachine sections, with detailed labeling of major locks, canals, and power dams. Cross sections of the lock and canal system are depicted
At a Glance
Lake Michigan shoreline
Great Lakes summary
Quizzes
water glass on white background. (drink; clear; clean water; liquid)
Water and its Varying Forms
Shallow staghorn water corals in fringing reef at low tide in Thailand. (coral reefs; endangered area; ocean habitat; sea habitat; coral reef)
Unknown Waters
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Great Lakes: Media

lake system, North America
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Videos

How invasive mussels threaten the Great Lakes
Clean water can be a bad thing.
Video: Encyclopædia Britannica, Inc.

Images

Marquette
Marquette Harbor Lighthouse on Lake Superior, Marquette, Michigan.
Dale Fisher, US Army Corps of Engineers
The Great Lakes and their drainage basin
Encyclopædia Britannica, Inc./Refugio Mariscal
Niagara Falls
Niagara Falls.
© Glen Allison—Photodisc/Getty Images
Welland Canal
Two ships using the Welland Canal, which connects Lake Erie with Lake Ontario in...
© Photos.com/Getty Images
Lake Michigan shoreline
Sand dunes on the shore of Lake Michigan.
© espiegle—iStock/Getty Images
St. Lawrence hydrographic system
The St. Lawrence hydrographic system, with the five main sectors of the St. Lawrence...
Encyclopædia Britannica, Inc.
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