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Tributaries of the Ahr are (from the mouth to the source): Harbach (Ahr), Hellenbach, Bachemer Bach, Leimersdorfer Bach, Liersbach, Vischelbach, Sahrbach, Kesselinger Bach, Armuthsbach, Dreisbach (brook), Eichenbach, Adenauer Bach, Trierbach and Ahbach.