Aa

The Aa — known as the Johannisbach in its upper reaches — is a small left tributary of the Werre, flowing through the urban areas of Bielefeld and Herford in northeastern North Rhine-Westphalia. Its riverside path serves as a quiet green corridor for walkers and cyclists navigating the city away from main roads. As a local recreational waterway, the Aa offers a modest natural counterpoint to the surrounding urban fabric.