Its karst spring is inside the walls of the former nunnery at "Offenhausen", a small settlement near Gomadingen.

Although the Swabian Alb is heavily karstified, this river's water runs aboveground all the way.

In addition to the untouched nature and the numerous castles and ruins, there are other places of interest, such as the main and country stud farm of Marbach with its world-famous horse breeding, the baroque cathedral Münster Unserer Lieben Frau in Zwiefalten, the Wimsener cave that can be navigated by boat or the former military training area in Münsingen.

[2] In order to avoid over-exploitation of the water body, it is not permitted to drive on weekends and public holidays between Buttenhausen and Anhausen from 1 July to 30 September.

For the section between Unterwilzingen and the mouth of the Danube, a pass at a level of 75  cm and more at Lauterach[3] is not permitted.