Manicouagan Impact Crater on Earth . ... Credit Copyright: STS-9 Crew , NASA Explanation: The Manicouagan Crater in northern Canada is one of the oldest impact craters known. Formed during a surely tremendous impact about 200 million years ago, the present day terrain supports a 70-kilometer diameter hydroelectric reservoir in the telltale form of an annular lake . ... Also visible above is the vertical fin of the Space Shuttle Columbia from which the picture was taken in 1983. ...