Sinkholes II - Immendingen

Welcome to Sinkholes II - Immendingen

A unique natural phenomenon – the Danube sinkhole in the Danube mountain range: 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 sinkholes near Immendingen. Cologne is located on the Danube and Vienna is located on the Krähenbach? We all learned in school that "the Danube flows into the Black Sea" – but that 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 sinkholes in the riverbed. A lot of water always flows underground to the source of the Aach in Hegau. From there, it flows back to the surface in the Radolfzeller Aach to Lake Constance, from where it continues its long journey. This is how the water from the Danube, together with the water from the Rhine, reaches the North Sea. In a sense, Cologne, Bonn, Düsseldorf, and many other cities are also located on the Danube! In summer, the riverbed is dry for weeks. You can hike through the Danube on the Premiumweg Donauversinkung trail without getting your feet wet. But doesn't that also mean that in summer, Vienna is not located on the Danube, but perhaps on the Krähenbach, the nearest tributary of the Danube near Möhringen? The Danube sinkhole is an official geopoint of the **[UNESCO Global Geopark Swabian Alb](https://www.geopark-alb.de/geopark-erleben/reise-in-die-erdgeschichte/)**.

Source: DZT Knowledge Graph