Lake Agassiz

Near the end of the last Ice Age, Lake Agassiz was an immense proglacial lake fed by the retreating Laurentide Ice Sheet across parts of present-day Canada and the northern United States. Covering a vast lowland and at times larger than all the modern Great Lakes combined, it repeatedly expanded, shrank, and changed outlets as the ice margin shifted. Its drainage carved major valleys, including the Minnesota River valley, and left the flat plain of the Red River of the North. Its final major collapse around 8,200 years ago left several modern lakes and may have influenced sea level, ocean circulation, and abrupt climatic cooling.

Manitoba · Canada