Deep Bay crater
Encyclopedia
Deep Bay is a bay near the south-western tip of Reindeer Lake
Reindeer Lake
Reindeer Lake is a lake in Western Canada located on the border between northeastern Saskatchewan and northwestern Manitoba, with the majority in Saskatchewan. The name of the lake appears to be a translation of the Algonquian name...

 in Saskatchewan
Saskatchewan
Saskatchewan is a prairie province in Canada, which has an area of . Saskatchewan is bordered on the west by Alberta, on the north by the Northwest Territories, on the east by Manitoba, and on the south by the U.S. states of Montana and North Dakota....

, Canada. The bay is strikingly circular and very deep (220 m) in an otherwise irregular and shallow lake.

The bay was formed in a 13 km wide impact crater
Impact crater
In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...

. The age of the crater is estimated to be 99 ± 4 million years (Cretaceous
Cretaceous
The Cretaceous , derived from the Latin "creta" , usually abbreviated K for its German translation Kreide , is a geologic period and system from circa to million years ago. In the geologic timescale, the Cretaceous follows the Jurassic period and is followed by the Paleogene period of the...

).
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