Lots of people got this one. The answer is Manicouagan Crater, in Quebec, Canada. it is the remnant of an asteroid impact approximately 200 million years ago.
Getting this one correct:
- Karel
- Ron Schott
- Roland
- Stephen Hope
- Nathan D
- Spathiinc
- Ben Bayer
- ACG
- Brian T
- Andy McAllister
No photos of the crater, because honestly, it is only noticeable from space.