Annular lake

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Lake Manicougan
A satellite photograph of the Siljan Ring. Lake Siljan is a large part of the SW edge of the much-eroded crater.

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 100 km (60 mi) across, with its 70 km (40 mi) diameter inner ring its most prominent feature; it contains a 70 km (40 mi) diameter annular lake, surrounding an inner island plateau, René-Levasseur Island. It is the earth's fifth-largest confirmed impact crater according to rim-to-rim diameter.[1]

Another example is the Siljan Ring.


  1. ^ "Impact Structures listed by Diameter (Increasing)". PASSC. Retrieved 6 July 2012.