The
East Frisian Islands (German:
Ostfriesische Inseln,
Frisian:
Eastfryske eilannen) are a chain of islands in the
North Sea, off the coast of
East Frisia in
Lower Saxony,
Germany. The islands extend for some from west to east between the
mouths of the
Ems and
Jade /
Weser rivers and lie about 3.5 to 10 km offshore. Between the islands and the mainland are extensive
mudflats, known locally as
Watten, which form part of the
Wadden Sea. In front of the islands are Germany's territorial waters, which occupy a much larger area than the islands themselves. The islands, the surrounding mudflats and the territorial waters (The
Küstenmeer vor den ostfriesischen Inseln nature reserve) form a close ecological relationship. The island group makes up about 5% of the
Lower Saxony Wadden Sea National Park.