- References
{{refimprove|date=February 2018}}An annular lake is a circular lake caused by the impact of a meteor. One of the largest annular lakes is Lake Manicouagan in Canada; the crater is a multiple-ring structure about {{convert|100|km|-1|abbr=on}} across, with its {{convert|70|km|-1|abbr=on}} diameter inner ring its most prominent feature; it contains a {{convert|70|km|-1|abbr=on}} diameter annular lake, surrounding an inner island plateau, René-Levasseur Island. It is Earth's sixth-largest confirmed impact crater according to rim-to-rim diameter.[1] Another example is the Siljan Ring. References1. ^{{cite web|title=Impact Structures listed by Diameter (Increasing) |url=http://www.passc.net/EarthImpactDatabase/Diametersort.html|publisher=PASSC|accessdate=6 July 2012}}
{{Geo-term-stub}} 1 : Annular lakes |