Nonnenbach (Ahr)
{{short description|River in Germany}}
{{infobox river
| name = Nonnenbach
| map =
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| subdivision_type1 = Country
| subdivision_name1 = Germany
| subdivision_type2 = State
| subdivision_name2 = North Rhine-Westphalia
| subdivision_type3 = Reference no.
| subdivision_name3 = DE: 271812
| length = 6.992 km {{GeoQuelle|DE-NW|GSK3C}}
| width_avg =
| depth_avg =
| source1_location = Dahlem-Schmidtheim
| source1_coordinates = {{Coord|50.4136639|6.5893417|type:river_region:DE-NW|format=dms|display=inline,title}}
| source1_elevation = {{Höhe|539|DE-NHN|link=true }}
| mouth_location = Ahr near Blankenheim
| mouth_coordinates = {{Coord|50.4242028|6.6705556|type:river_region:DE-NW|format=dms|display=inline}}
| mouth_elevation = {{Höhe|407|DE-NHN|link=true}}
| basin_population =
| basin_landmarks = Villages: Nonnenbach
| progression = {{RAhr}}
| basin_size = 10.885 km2 {{GeoQuelle|DE-NW|GSK3C}}
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| custom_label = References
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The Nonnenbach is a seven-kilometre-long tributary of the Ahr in the area of Blankenheim in the district of Euskirchen in the German state of North Rhine-Westphalia.
Geography
= Course =
The source of the Nonnenbach lies in woods about 2 kilometres east of Schmidtheim, on the far side of the B 51 and not far from gravel pits already partly filled with groundwater. It flows past the eponymous village and empties into the Ahr a good 2 kilometres south of Blankenheim. Apart from the Seidenbach and the Günzelbach it is also fed during its short course by the streams of numerous gullies, known locally as Seifen.
= Tributaries =
- Mittlerer Seifen (left)
- Seidenbach (left), 2.0 km
- Günzelbach (left), 1.8 km
- Wallbach (left), 1.8 km