Surrounded by, and at times even flooded by the sea, the halligen – small marsh islands without protective dykes – lie within a biosphere protected as a UNESCO World Heritage site in the North-Frisian Wadden Sea. Owing to their exposed situation in the Wadden Sea, the halligen and their inhabitants are particularly affected by rising sea levels and storm surges. The new development of Warft Treuberg is designed to cope with these special conditions. It fulfils several roles at the same time: it is a home and a protected fortress, a workplace and a place of relaxation. The development includes a general store supplying the daily needs of the halligen residents and holidaymakers, a health centre, permanent residences, and the two works units of the municipality and the coastal protection authority.