Course
The Aar has its source in the Hessian Taunus south of Limes, 500 meters from the ruins of Roman Castle Zugmantel and the Bundesstraße 417 in the Orlen part of Taunusstein. It flows first to the South, and then in a wide valley running in a southwesternly direction through Neuhof, Wehen, Hahn (all in Taunusstein) and Bleidenstadt. After Bleidenstadt the valley narrows, and the Aar reaches its southernmost point and turns to the northwest. In Bad Schwalbach its only nameworthy left tributary, Nesselbach, enters into it, and it reaches the town's Adolfseck area. Shortly thereafter it crosses the Limes. Below the Burg Hohenstein it passes by the town of the same name and above Michelbach it becomes the border river with Rheinland-Pfalz for a few kilometers. In Aarbergen the river then flows by Michelbach and Kettenbach and takes in its most significant tributary, the 15 kilometer Aubach (historical name: Strinzbach), which has its source quite close to the Aar, just north of the Limes. Thereafter the valley leads to Hausen über Aar and to the last Hessian town, Rückershausen. After crossing the bundesland border, the Aar runs through about 14 km of Rheinland-Pfalz, touching on the towns Schiesheim, Zollhaus and Hahnstätten, Oberneisen, Niederneisen and Flacht. With the townships of Holzheim and Freiendiez it reaches Diez and enters the Lahn.
Read more about this topic: Aar (Lahn)