Westphalian Aa
| Aa | |
|---|---|
 |
|
 |
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 North Rhine-Westphalia
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| Country | Germany |
| State | North Rhine-Westphalia |
| Physical characteristics | |
| River mouth |
Werre 52°07′25″N 8°40′13″E / 52.1236°N 8.6703°ECoordinates: 52°07′25″N 8°40′13″E / 52.1236°N 8.6703°E |
| Length | 26.0 km (16.2 mi) |
| Basin features | |
| Progression | Werre→ Weser→ North Sea |
| Basin size | 256 km2 (99 sq mi) |
Aa (also: Westfälische Aa, "Westphalian Aa") is a river of North Rhine-Westphalia, Germany. It is a left tributary of the Werre, which it joins in Herford. It is formed by the confluence of two small streams in Bielefeld-Milse. In its upper part, it is called Johannisbach.
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