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Posted on @rawstates
Lake Agassiz leaves the flattest land in America
9000 BC
Hillsboro, North Dakota
Public domain · Wikimedia Commons
A glacial lake larger than all the Great Lakes combined stood here for four thousand years and settled its silt into a bed so level the valley drops about a foot every mile. That flatness gave the region some of the deepest topsoil on earth and also its central problem: water arriving faster than a floor this flat can shed it.
That was 1 of the hidden places.
Location: approximate area
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