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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:

Treene was an Amt ("collective municipality") in the district of Nordfriesland, in Schleswig-Holstein, Germany. It was situated between Husum and the Eider River. Its seat was in Mildstedt. In January 2008, it was merged with the Ämter Friedrichstadt, Nordstrand and Hattstedt to form the Amt Nordsee-Treene. The Amt Treene consisted of the following municipalities:

Mildstedt (Danish: Mildsted) is a municipality in the district of Nordfriesland, in Schleswig-Holstein, Germany.

Wisch (Danish: Visk, North Frisian: Väsk) is a municipality in the district of Nordfriesland, in Schleswig-Holstein, Germany.

Südermarsch (Danish: Sønder Marsk) is a municipality in the district of Nordfriesland, in Schleswig-Holstein, Germany.

Oldersbek (Danish: Oldersbæk) is a municipality in the district of Nordfriesland, in Schleswig-Holstein, Germany.

Friedrichstadt was an Amt ("collective municipality") in the district of Nordfriesland, in Schleswig-Holstein, Germany. Its seat was in Friedrichstadt. In January 2008, it (with the exception of the town Friedrichstadt) was merged with the Ämter Hattstedt, Nordstrand and Treene to form the Amt Nordsee-Treene. The Amt Friedrichstadt consisted of the following municipalities: Drage Friedrichstadt Koldenbüttel Seeth Uelvesbüll Witzwort

Koldenbüttel (North Frisian: Koolnbütel, Low German: Kombüddel, Danish: Koldenbøl, Koldenbyttel) is a municipality in the district of Nordfriesland, in Schleswig-Holstein, Germany.

The Hermann Tast School (German:Hermann-Tast-Schule) is a humanistic high school in Husum. It was founded in 1527 and named after the theologian Hermann Tast (1490–1551), who was born in Husum. Before 1914, it was called the Husum Grammar School (German:Husumer Gelehrtenschule).

Schwesing (Danish: Svesing, North Frisian: Swiasing) is a municipality in the district of Nordfriesland, in Schleswig-Holstein, Germany.

Ramstedt (Danish: Ramsted) is a municipality in the district of Nordfriesland, in Schleswig-Holstein, Germany.

The Treene (Danish: Trenen) is a river, hydrologically 95 km (59 mi) and nominally 73.4 km (45.6 mi) long, in Southern Schleswig in the north of Schleswig-Holstein, Germany. It is a right-bank tributary of the River Eider. It starts in northern Angeln, southeast of Flensburg, and flows mainly south-south-west before joining the Eider near Friedrichstadt. The upper course are called Bondenau (Danish: Bondeå) and Kielsau (Danish: Kilså). Its source is situated in the ground of Mohrkirch. The name 'Treene' begins at the Treßsee (Danish: Træsø) lake near Großsolt in the district of Schleswig-Flensburg. After about 73 km (45 mi) it reaches the town of Friedrichstadt (in Nordfriesland district). There it is released through valves into the estuary of the Eider, 25 km (16 mi) above the Eider Barrage. It is the most important tributary of the River Eider. Since the construction of Kiel Canal it has been even stronger than the Eider river.