In fact, Lake Manicouagan is located inside the homonymous crater located in Quebec (Canada). The crater at the time of its formation had a diameter of about 100 km. Due to erosion (mainly due to the work of glaciers) its diameter has now reduced to 72 km, but it remains one of the largest craters visible on the Earth's surface.
The Manicouagan Crater is also one of the oldest known terrestrial craters: it was formed 215 million years ago, when an asteroid with a diameter of 5 km hit the surface.
Mount Babel, in the center of the island inside the lake, is what remains of the central peak of the crater formed following the impact. It rises for about 600 meters respect to the level of the lake.
Credit: Sentinel 2, ESA.
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