The Halligen Islands, North Frisian Islands, Nordfriesland, Germany

Dwellings and commercial buildings are built upon metre-high, man-made mounds, called Warften in German, to guard against storm tides. Some Halligen also have overflow dikes.
Not very many people live on the Halligen. Their livelihoods are mainly based on tourism, coastal protection, and agriculture. This last activity mainly involves raising cattle in the fertile, often flooded, salt meadows.
The Halligen are to be found in the Schleswig-Holsteinisches Wattenmeer National Park. The commercially developed Halligen Nordstrandischmoor, Gröde, Oland, Langeneß, and Hooge are surrounded by the protected area, but not an integral part of it. The smaller Halligen Habel, Südfall, Süderoog, and Norderoog as well as the Hamburger Hallig are parts of the national park. Walks on the tidal flats and informational meetings are offered by tourist boards and the park administration.
In the west the German Halligen are protected from the open sea by the North Frisian Barrier Island.