Wikipedia:WikiProject Germany/Portal:Schleswig-Holstein/Article of the month/2010-08

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

The Treene begins at the Treßsee lake near Großsolt in the district of Schleswig-Flensburg and flows for about 73 km, passing the town of Friedrichstadt (in Nordfriesland district) to a point 25 km above the Eider Barrage where it discharges into the Eider as its most important tributary. The Bondenau, which is the most important inlet to the Treßsee, is the main headstream of the Treene, and rises 15 km east of the Treßsee near Sörup on the Angeln peninsula, bounded by the Flensburger Förde and the Schlei. So the Treene is an unusual case of a river that rises on a peninsula in the Baltic Sea, but then flows into the North Sea. Between the Treßsee and Tüdal, there is a nature reserve covering an area of 20 km2 called Ober Treenelandschaft which runs along the river. more...