Treene River

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River near Wohlde.

The Treene (Danish: Trenen) is a river in the north of Schleswig-Holstein in Germany, a right-bank tributary of the Eider River. It starts in northern Angeln southeast of Flensburg and flows mostly south-south-west and joins the Eider near Friedrichstadt. It is 73 km (45 miles) long.

It flows from the Treßsee lake near Großsolt in the Schleswig-Flensburg Kreis and flows about 73 km by Friedrichstadt (in Nordfriesland Kreis) to 25 km above the Eidersperrwerk into the Eider, whose most important tributary it is. The Bondenau, as the most important supply of the Treßsee, is the main headwater of the Treene, rises 15 km east of the Treßsee by Sörup on the Angeln peninsula, which is bounded Flensburger Förde and the Schlei. Therefore the Treene is the special case of a river that flows into the North Sea, which rises on a peninsula in the Baltic Sea. From the Treßsee to Tüdal is the part of the 20-square-kilometer nature protection project Ober Treenelandschaft which is along the Treene.

The middle section between Oeversee and Langstedt and Treia developed to the popular paddle district; further river downward the Eider Treene concern valley forms an ecologically valuable retreat area for migratory birds ("stork village" Bergenhusen). In Schwabstedt a river public swimming pool exists; off there the Treene can be driven on muendungswaerts also with sport boats.

In early historical time the strip of dry country between Treene (Niederung) and Schlei had the function of an isthmus. Here the Danewerk secured the south border of Denmark, which at that time was more than 20 km further south running to the Eider. And the route Eider - Treene - Rheider Au (tributary of the Treene) - Schlei served as a shipping route between the North Sea and Baltic Sea (see also Haithabu). Whether thereby boats were pulled between the Schleibucht Selker Noor and the Rheider Au 16 km on primitive rollers over the 20 m high land ridges (usual opinion), or whether the Kograben, 1 to 2 km south of and parallel to the Danewerk, served as the ship canal, is not yet finally clarified.