through the karst, the new headwaters of the Danube will be the Krähenbach where it currently meets the Danube ( ) and the Elta where it currently meets the Danube (). External links Nachlese: Report on search for the underground river Danube Testimony of the discovery of the Danube cave Website about the construction of access to and further exploration of the Danube cave Footnotes Danube Sinkholes of Europe Karst formations of Germany Landforms of Baden-Württemberg Rhine South German Scarplands Landforms of Germany