The Manicouagan Crater, located at [show location on an interactive map] 51°23′N 68°42′W / 51.383, -68.7Coordinates: [show location on an interactive map] 51°23′N 68°42′W / 51.383, -68.7 in northern Canada, about 300 km (190 mi) north of the city of Baie-Comeau, is one of the oldest known impact craters. It is thought to have been caused by the impact of a 5 km (3.1 mi) diameter asteroid about 214 million years ago (Triassic period), and may be associated with the end-Carnian extinction event.
The crater is a multiple-ring structure about 100 km (62 mi), with its 70 km (43 mi) diameter inner ring its most prominent feature; it contains a 70 km (43 mi) diameter annular lake, the Manicouagan Reservoir, surrounding an inner plateau.
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