Sinkholes II - Immendingen

Welcome to Sinkholes II - Immendingen

A unique natural phenomenon—the Danube’s subsidence in the Donaubergland region: The Danube flows into two oceans—above ground into the Black Sea and underground to Lake Constance, and from there into the North Sea. There are several points where it subsides. Cologne is on the Danube, and Vienna is on the Krähenbach? We all learned in school: “The Danube flows into the Black Sea”—but that doesn’t apply to the entire Danube. That’s because between Immendingen and Tuttlingen in the Donaubergland region, a large portion of the Danube’s water sinks and seeps away. And here in the Immendingen area known as “Im Brühl,” there are several sinkholes right in the riverbed. A (large) amount of water constantly flows underground all the way to the source of the Aach in Hegau. From there, when it is forced to the surface via the Aachtopf, it flows through the Radolfzeller Aach into Lake Constance. From Lake Constance, it continues its long journey via the Rhine and the Rhine Falls. In this way, the Danube’s water, together with that of the Rhine, reaches the North Sea. In a sense, Cologne, Bonn, Düsseldorf, and many other cities are also located on the Danube! In the summer, the Danube’s riverbed in this section between Immendingen and Tuttlingen-Möhringen in the Donaubergland region remains dry for weeks on end. During this time, you can hike through the Danube on the “Danube Sinkage” Premium Trail without getting your feet wet. But doesn’t that also mean that in the summer, Vienna isn’t actually on the Danube, but perhaps on the Krähenbach, the Danube’s nearest tributary near Möhringen? The Danube’s subsidence is an official geopoint of the UNESCO Global Geopark Schwäbische Alb.

Source: DZT Knowledge Graph