The largest group of freshwater glacial lakes in the world are the Great Lakes, located at the border of Canada and the USA. They are estimated to have formed by a retreating glacier during the last ice age, 10,000 years ago, when the Laurentide ice sheet retreated. Because of the combination of moving plate tectonics millions of years ago, and a formed mid continent rift, the meltwater filled the valley and formed the Great Lakes.
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