Circular Manicouagan Reservoir, the “Eye of Quebec”, Canada51.3N 68.6W
The circular shape occupying this image is the Manicouagan Reservoir, a lake in central Quebec, Canada. The lake has a distinctive ring shape because it lies within the remnants of an ancient eroded impact crater (astrobleme).
Due to shape it is sometimes called “The Eye of Quebec”. Here, most of the lake is frozen and thus appears white, although a section on the eastern side is mostly ice-free.