It is not surprising that Lake Superior is often described as a freshwater sea. There’s enough water in the lake to cover the North and South American continents a foot deep. In fact, its 3-quadrillion gallons could fill all the other Great Lakes plus three more Lake Eries as well. It takes an average of 191 years for a drop of water to circulate the basin before exiting at the Lake’s only natural outflow: the St. Mary’s River at Sault Ste Marie. Two billion years ago a volcanic rift that nearly tore the continent apart, formed the basin which filled…
The Freshwater Sea
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