The Okotoks Erratic is a massive boulder sitting in the middle of a prairie landscape just west of Okotoks in southern Alberta. According to the Government of Alberta, it’s considered the largest glacial erratic in the world and was carried from its original location by moving glaciers thousands of years ago. Today, it sits alone, surrounded by flat open land, which makes its size and presence even more striking. Known as “Big Rock,” it has beco…
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