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The Ahr as a main river and the Nebenbaeche flows to the Osteifel for the Ahr-Eifel . This watershed is approximately 900 km². Ahr Nebenbaeche flows (from the delta river upward) Harbach (Ahr) , Hellenbach , Bachemer Bach , Leimersdorfer Bach , Liersbach , Vischelbach , Sahrbach , Kesselinger Bach , Armuthsbach , Dreisbach (brook) , Eichenbach , Adenauer Bach , Trierbach und Ahbach .
There were isolated settlements in the Ahr valley at the latest since the Roman times, the Roman mansion was with the Silberberg in Ahrweiler
That changed from themid - 19th century. The development of the settlements, the traffic routes and the agricultural areas in the Ahrtal led to the fact that the riverbed was used.