From a bit later in the trip is a photo from the shore of Manicouagan Reservoir. According to Wikipedia [1], it's an annular lake formed about 214 million year

From a bit later in the trip is a photo from the shore of Manicouagan Reservoir. According to Wikipedia [1], it's an annular lake formed about 214 million years ago by the impact of a meteor 5 km in diameter. It has an outer diameter of about 72 km, and it's "the Earth's sixth-largest confirmed impact crater according to rim-to-rim diameter", and one of the oldest known. [1] https://en.wikipedia.org/wiki/Manicouagan_Reservoir https://en.wikipedia.org/wiki/Manicouagan_Reservoir