Manicouagan Reservoir is an annular lake in northern Quebec, Canada, the remnant of an impact crater made approximately 212 million years ago, by a 5 km diameter asteroid. It is today 72 km in diameter.
Pretty, Lakes, Craters
The lake was created by a series of hydroelectric dams in the 1960s. The lake acts as a giant hydraulic battery for Quebec, and generates enough power that some is left over in the summer for sale to New England in the U.S.