Ahr

Ahr () is a river in Germany, a left tributary of the Rhine. Its source is at an elevation of approximately above sea level in Blankenheim in the Eifel, in the cellar of a timber-frame house near the castle of Blankenheim. After it crosses from North Rhine-Westphalia into Rhineland-Palatinate.

The Ahr flows through Ahr valley or ''Ahrtal'', passing through the towns of Schuld, Altenahr and Bad Neuenahr-Ahrweiler. Between Remagen and Sinzig (south of Bonn), at about above sea level, it flows into the Rhine. The length is roughly , of which is within Rhineland-Palatinate. The Ahr has a gradient of 0.4 percent in its lower course, and 0.4 to 0.8 percent in its upper course.

The Ahr and its tributaries are a main drainage system of the eastern Eifel. The watershed is approximately . Provided by Wikipedia