The Zwiefalter Aach or Zwiefalter Ach is a river in

Reutlingen district Reutlingen, nicknamed "The Gate to the Swabian Alb" (german: "Das Tor zur Schwäbischen Alb"), is a ''Landkreis'' (district) in the middle of Baden-Württemberg, Germany. The former free imperial city (until 1802) reached the limit of 100,000 res ...

and

Biberach district Biberach () is a ''Landkreis'' (district) in Baden-Württemberg, Germany. It is bounded by (from the south and clockwise) the districts of Ravensburg, Sigmaringen, Reutlingen and Alb-Donau, and the Bavarian districts Neu-Ulm, Unterallgäu and t ...

Baden-Württemberg Baden-Württemberg (; ), commonly shortened to BW or BaWü, is a German state () in Southwest Germany, east of the Rhine, which forms the southern part of Germany's western border with France. With more than 11.07 million inhabitants across a ...

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

. It is approximately 9 kilometres long and is a tributary of the

Danube The Danube ( ; ) is a river that was once a long-standing frontier of the Roman Empire and today connects 10 European countries, running through their territories or being a border. Originating in Germany, the Danube flows southeast for , p ...

near

Zwiefalten Zwiefalten is a municipality in the district of Reutlingen, Baden-Württemberg, Germany located halfway between Stuttgart and Lake Constance. The former Zwiefalten Abbey dominates the town. The former monastery is considered one of the finest exa ...

. The river is known for the

Wimsener Höhle The Wimsener Höhle (or Wimsen Cave) is Germany´s only water cave, which can be visited by boat. It is located in the municipal area of Hayingen on the Swabian Alb, about three kilometers north of Zwiefalten. Description The Wimsener Höhle or ...

References

Rivers of Baden-Württemberg Rivers of Germany {{BadenWürttemberg-river-stub