The Wadden Sea, Netherlands, Germany, and Denmark

THE WADDEN SEA (Netherlands, Germany, and Denmark)

This intertidal zone in the SE part of the North Sea lies between the coast of NW Europe and the Frisian Islands. It forms a shallow body of water with tidal flats and wetlands, and high biological diversity. Its 3,900 square miles touch a 310-mile coastline; the dikes built to control flooding make it one of the most human-altered habitats on earth.

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(Image courtesy Wikimedia Commons; CTTO)