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World's Strangest Lakes

World's Strangest Lakes: Lake Manicouagan

LWM/NASA/LANDSAT / Alamy

Lake Manicouagan, Canada

Problem: You can’t decide if you want to visit a lake or a river. Solution: Lake Manicouagan, in Quebec. Plenty of lakes are round in shape, but this is the only known lake that has been cast into the form of a ring. It was created 200 million years ago when a 3.1-mile-diameter asteroid—the fifth largest ever—crashed into the earth and left behind what appears to be the world’s only concentric river. At 1,206 square miles, roughly half the size of Delaware, it’s one of the few lakes whose primary island takes up more surface area than actual water, giving you the best of both a lake and a river.

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