Nordsee-Treene is an Amt ("collective municipality") in the district of Nordfriesland, in Schleswig-Holstein, Germany. Its seat is in Mildstedt. It was formed on 1 January 2008 from the former Ämter Friedrichstadt (except the town Friedrichstadt), Hattstedt, Nordstrand and Treene.
The Amt Nordsee-Treene consists of the following municipalities:
Arlewatt Drage Elisabeth-Sophien-Koog Fresendelf Hattstedt Hattstedtermarsch Horstedt Hude Koldenbüttel Mildstedt Nordstrand Oldersbek Olderup Ostenfeld Ramstedt Rantrum Schwabstedt Seeth Simonsberg Süderhöft Südermarsch Uelvesbüll Winnert Wisch Wittbek Witzwort Wobbenbüll
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