The northern coast of Vlieland, Wadden islands, The Netherlands - stock photo

Dune with beach grass -Ammophila arenaria-, Vlieland, province of Friesland, The Netherlands. Vlieland belongs to the Frisian islands. The Frisian Islands, also known as the Wadden Islands or Wadden Sea Islands, form an archipelago at the eastern edge of the North Sea in northwestern Europe, stretching from the northwest of the Netherlands through Germany to the west of Denmark. The islands shield the mudflat region of the Wadden Sea (large parts of which fall dry during low tide) from the North Sea. The Wadden sea was added to the Unesco world heritage list in 2009.