A few years ago, I had a dream, involving a lake that I had never been to and did not even know existed at the time. When I awoke, I went to Google Maps and zoomed in on where the lake had appeared to me in my dream. Sure enough, it totally exists, and is just as hardcore as my dream would suggest.
To borrow from the Wikipedia page:
The Lac à l’Eau Claire (the official name, in French), also called the Clearwater Lakes in English, Wiyasakami in Cree and Allait Qasigialingat by the Inuit, are a pair of circular lakes on the Canadian Shield in Quebec, Canada, near Hudson Bay.
The lakes were created by a double meteor impact roughly 290 million years ago:
The lakes fill circular depressions that are interpreted as paired impact craters (astroblemes). The eastern and western craters are 26 km (16 mi) and 36 km (22 mi) in diameter, respectively. Both craters have the same age, 290 ± 20 million years (Permian), and it is believed that they formed simultaneously. The impactors may have been gravitationally bound as a binary asteroid, a suggestion first made by Thomas Wm. Hamilton in a 1978 letter to Sky & Telescope magazine in support of the then-controversial theory that asteroids may possess moons.
There’s more information about the lakes here, though it’s worth noting, there isn’t really anything up there. Like, no one. The entire “unorganized territory” that spans that area had only 16 people, total, according to the 2006 census, in ~129,712 square kilometers. One of these days, I’d really like to charter an expedition up there, and spend some time exploring the lakes and islands. I’ve had this compulsion to head up there for five years, now. Maybe one of these days, I’ll finally manage to do it.