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The retention time for each of the Great Lakes is different, and Lake Superior has the longest retention time of all the Great Lakes. When a drop of rainwater lands in Lake Superior, it takes over 200 years for it to pass through the Great Lakes to the Atlantic Ocean. Once it leaves the Great Lakes system, it has to travel though the St. Lawrence River on its way to the ocean.

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Q: How long does it take for water to pass through the Great Lakes to the Atlantic ocean?
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Related questions

What drains the Great Lakes into the Atlantic Ocean?

No. Wrong direction. All of the great lakes empty into the Atlantic, through the St. Lawrence river.


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