Jens Carsten Jantzen (born 18 October 1948, Störtewerkerkoog, Nordfriesland) is a mathematician working on representation theory and algebraic groups, who introduced the Jantzen filtration, the Jantzen sum formula, the Jantzen conjecture, and translation functors.
Karrharde Frisian (Karrhiirderfreesch) is a dialect of the North Frisian language spoken in the municipalities of Stedesand and Enge-Sande in the German Amt of Südtondern (formerly Karrharde) in the district of Nordfriesland, Schleswig-Holstein.
Stedesand is a municipality in the district of Nordfriesland, in Schleswig-Holstein, Germany.