Sinkholes II - Immendingen

Welcome to Sinkholes II - Immendingen

A unique natural phenomenon - the Danube seepage: a river suddenly flows into two oceans, above ground into the Black Sea and underground to Lake Constance and from there into the Rhine into the North Sea. Cologne is on the Danube and Vienna is on the Krähenbach? We all learned in school: "The Danube flows into the Black Sea" - but this does not apply to the entire Danube. Between Immendingen and Tuttlingen, a large part of the Danube's water sinks and seeps away. And here in the "Im Brühl" area, there are several swallow holes in the riverbed. There is always (a lot of) water flowing underground to the source of the Aach in Hegau. From there it flows back to the surface in the Radolfzeller Aach into Lake Constance, from where it continues its long journey. In this way, the Danube water, together with the water from the Rhine, reaches the North Sea. If you like, Cologne, Bonn, Düsseldorf and many other cities are also on the Danube! In summer, the riverbed is dry for weeks at a time. You can hike through the Danube without getting your feet wet on the Donauversinkung premium trail. But doesn't that also mean that in summer Vienna is not on the Danube, but perhaps on the Krähenbach, the nearest tributary of the Danube near Möhringen?

Source: DZT Knowledge Graph