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Lake Ontario / Lake America
Introduction & Top Questions References & Edit History Related Topics
Images
Map showing Lake Ontario, also labeled as Lake America, with surrounding regions in southern Ontario, Canada, and northern New York, United States. The map highlights major cities such as Toronto, Hamilton, Rochester, and Oswego, as well as depth contours within the lake. Nearby smaller lakes, islands, and connecting waterways like the Niagara River and Erie Canal are also marked. Map showing the location of Lake Ontario in relation to the other Great Lakes and surrounding regions. Lake Ontario is labeled in the northeastern part of the map, bordered by the province of Ontario in Canada and the state of New York in the United States. The other Great Lakes-Lake Superior, Lake Michigan, Lake Huron, and Lake Erie-are also labeled, along with nearby U.S. states and Canadian provinces. Lake Ontario St. Lawrence River 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. Map of Lake Ontario showing its location on the border between southern Canada and northern United States, with surrounding cities such as Toronto, Hamilton, Kingston, Rochester, and Oswego, as well as islands, connecting rivers, and water depth contours.
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
Related Questions

Lake Ontario / Lake America: References & Edit History

Article Contributors

Primary Contributors

  • The Editors of Encyclopaedia Britannica
    Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

Other Encyclopedia Britannica Contributors

Article History

Type Description Contributor Date
Updated for the adoption of the name “Lake America” by the U.S. Board on Geographic Names. Sep 02, 2026
Article revised. Aug 31, 2026
Top Questions added. Aug 25, 2026
Map added. Jul 30, 2026
Add new Web site: American Fisheries Society - Ontario Chapter - Chronology of Lake Ontario ecosystem and fisheries. Jun 11, 2024
Map added. Apr 19, 2023
Add new Web site: LiveScience - Lake Ontario Facts. May 14, 2019
Added new Web site: How Stuff Works - Geography - Geography of Lake Ontario. Jul 27, 2008
Added new Web site: U.S. Environmental Protection Agency - Lake Ontario. Jan 21, 2008
Added new Web site: International Lake Environment Committee Foundation - Lake Ontario. Jan 21, 2008
Added new Web site: The Canadian Encyclopedia - Lake Ontario, North America. Jan 21, 2008
Article revised and updated. Aug 08, 2006
Article added to new online database. May 27, 1999
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