Since these three islands were administrative districts of their own, the area was originally called Dreilande - "Three Lands".
Alluvial soil won from the North Sea makes the area well-suited for agriculture.
At present, tourism dominates, particularly in the town of Sankt Peter-Ording on the peninsula's western tip.
The constant threat of the sea overcoming their habitations forced Eiderstedt to a special form of self-administration at a very early stage as diking was possible only through strong cooperation.
Originally settled by Frisians, Eiderstedt was part of the Duchy of Schleswig from the 14th century on.