Lake Michigan, one of North America's Great Lakes, covers approximately 58,000 km² and lies entirely within the United States — unlike the other Great Lakes, which are shared with Canada — making it the largest lake located entirely within a single country. This is a distinct comparison from the largest lake overall (the transboundary Caspian Sea) and from the largest lake by depth or volume (Russia's Lake Baikal, also entirely within one country but far smaller in surface area).
The question, scope, and sources behind this Registry record.
Lake Michigan, one of North America's Great Lakes, covers approximately 58,000 km² and lies entirely within the United States — unlike the other Great Lakes, which are shared with Canada — making it the largest lake located entirely within a single country. This is a distinct comparison from the largest lake overall (the transboundary Caspian Sea) and from the largest lake by depth or volume (Russia's Lake Baikal, also entirely within one country but far smaller in surface area).
The greatest surface area of any lake located entirely within the borders of a single country, as distinct from the largest lake overall (which is transboundary).
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The frontier as it changed over time.
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1 accepted Claim, with 1 linked evidence records.
Permanent ID limitsregistry.com/limits/LR-LARGEST-LAKE-SINGLE-COUNTRY
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Limits Registry. LR-LARGEST-LAKE-SINGLE-COUNTRY. Largest lake located entirely within one country. 2026.