Ahr

 ( Rivers Of North Rhine-westphalia ) 

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 framing 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 .

That began changing in the mid-19th century. The development of settlements and transportation routes (including three railway lines) and the expansion of the area used for agriculture in the Ahr valley led to the narrowing and constraint of the riverbed. The course of the river was graded and its banks were stabilized.

Catastrophic flash flooding occurred on the Ahr in 1910 and 2021 resulting in the deaths of hundreds.

The stream, which runs in a south-easterly direction, through the valley meadows of upper Ahr valley, has not cut very deeply into the heights of the Eifel. Much of the upper Ahr valley is protected and follows the B 258 federal road. Below the hamlet of Ahrdorf in the municipality of Blankenheim, the Ahr reaches its southernmost point and enters the state of Rhineland-Palatine. From Müsch via Antweiler to Fuchshofen, the river runs northwards and turns east at Schuld heading through Insul to Dümpelfeld. Here, the Ahr collects the waters of the Adenauer Bach coming from the right and flowing in a northeasterly direction. In Altenahr, the valley bends to the east and initially follows a very winding course. Here the river is accompanied by the B 267, although it does not follow every loop in the river. In Altenahr, the largest bend in the river beings; it is protected because of its flora and fauna. From here, the valley becomes a gorge bordered by the steep cliffs of the Ahr Hills. From Reimerzhoven the valley sides are dominated by vineyards, especially on the south-facing slopes north of the river, particularly around the villages of Mayschoß, Rech, Dernau and Marienthal. The last narrow point in the Ahr valley occurs below the Bunte Kuh ("coloured cow"), a rock formation that almost reaches the river and leaves little room for road and railway. In Walporzheim, the valley widens abruptly, and the Ahr passes through the county town of Bad Neuenahr. In Heimersheim, the vineyards end. The valley floor between Bad Bodendorf on the northern side and Sinzig on a terrace in the south is dominated by agriculture and fruit and vegetable growing.

The mouth of the Ahr lies on the plain of the Golden Mile, between the Remagen district of Kripp and the town of Sinzig at a height of about . Since being re-naturalised (from 1979, see aerial photographs) it has been one of the few natural river mouths on the Rhine and is under protection.

Blankenheim Eifel Ahrquelle.jpg|Source of the Ahr (in front of the head) in Blankenheim ahr01.jpg|The middle Ahr below Altenahr with the rock formation of Langfig Ahrtal02.jpg|The Ahr by the Bunte Kuh rock formation at Walporzheim Bundesarchiv Bild 195-0577, Rheinbefliegung, Niederbreisig - Kripp.jpg|The mouth of the Ahr on the Rhine before re-naturalisation (1957) Ahr, Mündung.jpg|The mouth of the Ahr after re-naturalisation. Right: this village of Kripp

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 from:start till:11.4 $right text:Schaafbach (11.4 km)
 from:start till:9.5 $right text:Lampertsbach (9.5 km)
 from:start till:7.1 $left text:Mühlenbach (7.1 km)
 from:start till:8.3 $right text:Michelsbach (8.3 km)
 from:start till:14.9 $right text:Ahbach (14.9 km)
 from:start till:25.3 $right text:Trierbach (25.3 km)
 from:start till:10.0 $left  text:Dreisbach (10.0 km)
 from:start till:18.4 $right text:Armuthsbach (18.4 km)
 from:start till:15.7 $right text:Adenauerbach (15.7 km)
 from:start till:14.5 $left text:Liersbach (14.5 km)
 from:start till:14.1 $right text:Kesselinger Bach (14.1 km)
 from:start till:15.3 $left text:Sahrbach (15.3 km)
 from:start till:10.5 $left text:Vischelbach (10.5 km)
 from:start till:8.3 $left text:Leimersdorfer Bach (8.3 km)
 from:start till:7.7 $right text:Hellenbach (7.7 km)
 from:start till:9.9 $right text:Harbach (9.9 km)
     

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• Golden Mile (Rhineland-Palatinate), the fertile plain at the mouth of the Ahr
• List of rivers of Rhineland-Palatinate
• List of rivers of North Rhine-Westphalia

• AhrtalGuide.com Pictures of this region
• Ahr 2000