The Aubach is an orographically left tributary of the River Wiehl in the German state of North Rhine-Westphalia. The Aubach rises north of Wendershagen, at the Heckenweiher, approximately 414 metres above sea level. It initially flows in a north-westerly direction. Not far from Erdingen, the Aubach merges with the Mohrenbach, which is about …The Aubach is an orographically left tributary of the River Wiehl in the German state of North Rhine-Westphalia. The Aubach rises north of Wendershagen, at the Heckenweiher, approximately 414 metres above sea level. It initially flows in a north-westerly direction. Not far from Erdingen, the Aubach merges with the Mohrenbach, which is about 1 kilometre long, then turns to the north-east. In the Pfänderwiese, another tributary, flows from the left into the Aubach. Further to the north, the Aubach reaches the Aubachtal.