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'''Lake Agassiz''' ({{IPAc-en|ˈ|æ|g|ə|s|i}} {{respell|AG|ə|see}}) was a large [[proglacial lake]] that existed in central [[North America]] during the late [[Pleistocene]], fed by [[meltwater]] from the retreating [[Laurentide Ice Sheet]] at the end of the [[last glacial period]]. At its peak, the lake's area was larger than all of the modern [[Great Lakes]] combined.<ref name="Perkins"/> It eventually drained into what is now [[Hudson Bay]], leaving behind [[Lake Winnipeg]], [[Lake Winnipegosis]], [[Lake Manitoba]], and [[Lake of the Woods]].
First postulated in 1823 by [[William H. Keating]],<ref>{{cite book |last1=Keating |first1=William H. |title=Narrative of an Expedition to the Source of St. Peter's River, Lake Winnepeek, Lake of the Woods, … |date=1824 |publisher=H.C. Cary & I. Lea |location=Philadelphia, Pennsylvania, U.S.A. |volume=2 |page=7 |url=https://www.biodiversitylibrary.org/item/48506#page/17/mode/1up}} From p. 7: "In some places pebbles were as abundant as if we had been travelling upon the bed of some former river or lake; the mind endeavours in vain to establish limits to the vast expanse of water which certainly at some former day overflowed the whole of that country."</ref> it was named by [[Warren Upham]] in 1879 after [[Louis Agassiz]], the then
== Geological progression ==
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