page_title: Manicouagan crater
hierarchical_section_title: Manicouagan crater
caption_attribution_description: English: STS009-048-3139 Manicouagan Reservoir, Canada December 1983. Located in a rugged, heavily timbered area of the Canadian Shield in Quebec Province, Manicouagan Reservoir is impressive in this low-oblique, west-looking photograph. The reservoir, a large annular lake, marks the site of an impact crater 60 miles (100 kilometers) wide. Formed almost 212 million years ago when a large meteorite hit Earth, the crater has been worn down by many advances and retreats of glaciers and other processes of erosion. The reservoir is drained at its south end by the Manicouagan River, which flows from the reservoir and empties into the Saint Lawrence River nearly 300 miles (483 kilometers) south.
context_page_description: The Manicouagan Crater is one of the oldest known impact craters. It is in the Côte-Nord region of Québec, Canada.
  It was caused by the impact of a 5 km diameter asteroid about 215.5 million years ago, in the Upper Triassic.
  The crater is a multiple-ring structure about 100 km across. Its inner ring is its most prominent feature. This is a 70 km diameter annular lake, the Manicouagan Reservoir, surrounding an inner island plateau. It is the earth's fifth largest confirmed impact crater.
context_section_description: The Manicouagan Crater is one of the oldest known impact craters. It is in the Côte-Nord region of Québec, Canada.
  It was caused by the impact of a 5 km (3 mi) diameter asteroid about 215.5 million years ago, in the Upper Triassic.
  The crater is a multiple-ring structure about 100 km (60 mi) across. Its inner ring is its most prominent feature. This is a 70 km (40 mi) diameter annular lake, the Manicouagan Reservoir, surrounding an inner island plateau. It is the earth's fifth largest confirmed impact crater.
caption: The crater in winter, photo by Space Shuttle mission STS-9, 1983. North --> lower right
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