is an uninhabited island in the Meldorf Bay, about 14 kilometres off the North Sea coast of Dithmarschen in north Germany – about 12 kilometres from the Trischendamm embankment. The island belongs to the municipality of Friedrichskoog and is only occupied from March to October by a bird warden from the Nature and Biodiversity Conservation Union or NABU. Otherwise it is out-of-bounds. Trischen originated about 400 years ago and moves about 3 m per month towards Büsum on the mainland.

Dithmarschen is a district in Schleswig-Holstein, Germany. It is bounded by the districts of Nordfriesland, Schleswig-Flensburg, Rendsburg-Eckernförde, and Steinburg, by the state of Lower Saxony, and by the North Sea. From the 13th century up to 1559 Dithmarschen was an independent peasant republic within the Holy Roman Empire and a member of the Hanseatic League.