Zwiefalter Aach
Zwiefalter Aach in Zwiefaltendorf
The Zwiefalter Aach or Zwiefalter Ach is a river in Reutlingen district and Biberach district in Baden-Württemberg, Germany. It is approximately 8 kilometres long and is a tributary of the Danube. The river is known for the Wimsener Höhle .[1]