The Frisian 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.

Most of the Frisian Islands are environmentally protected areas, and an international wildlife nature reserve is being coordinated between the Netherlands, Germany and Denmark. Natural gas and oil drilling continue, however, and in the vicinity of the Ems, Weser and Elbe estuaries, and ship traffic causes tension between wildlife protection and economic values.