Aa (Werre) Explained

Aa
Map:Germany River Aa Map.svg
Mouth Location:Werre
Mouth Coordinates:52.1236°N 8.6703°W
Subdivision Type1:Country
Subdivision Name1:Germany
Subdivision Type2:State
Subdivision Name2:North Rhine-Westphalia
Length:26km (16miles)
Basin Size:256km2
Pushpin Map:North Rhine-Westphalia
Pushpin Map Size:300
Pushpin Map Caption:North Rhine-Westphalia
Pushpin Map Alt:Relief Map of North Rhine-Westphalia

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.

See also