PETER MATULAVICH / SCIENCE PHOTO LIBRARY PETER MATULAVICH / SCIENCE PHOTO LIBRARY
Water from the Sydenham River rushing through spillway above Inglis Falls on the Niagara Escarpment near Owen Sound, Canada. The Sydenham is one of countless rivers that drain the Niagara escarpment, a 1,200 kilometer-long plateau that towers more than 500 meters over the surrounding land and Great Lakes.
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