Wadden Sea
The Wadden Sea is a part of the North Sea. It is an intertidal zone, up to 40 kilometres (25 mi) wide. It runs from the Netherlands to the South of Denmark. It is up to 450 kilometres (280 mi) of coastline. The land that appears at low tide is called mudflat in English (and Watt in German). It is at the origin of the latter name.
Wadden Sea Media
Salt marsh and mudflats in Westerhever, Germany
The mudflats of the Pilsumer Watt near Greetsiel, Germany
People on the beach on Borkum, Germany
Mudflat hiking near Pieterburen, Netherlands