Welcome to Sinkhole I
The Danube’s subsidence in the Donaubergland region is a natural phenomenon unique in the world: the Danube flows into two oceans. There are several subsidence points here. A large portion of the Danube’s water disappears into the ground at various locations.
The first major sinkhole of the Danube in the Danube Sinkage area is located in Immendingen in the Donaubergland, directly at the weir near the covered wooden bridge and close to the so-called Donauuferpark II.
At this first major sinkhole, individual larger sinkholes can be seen depending on the water level. At times, up to 8 square meters of Danube water per second already disappears into the ground here in the Danube riverbed.
Something truly extraordinary is happening in the Donaubergland, something unique worldwide: For between Immendingen and Fridingen, the Danube splits: Part of the Danube’s water sinks into the ground, while the other part—mostly—continues to flow above ground. Thus, the Danube flows into two seas—the Black Sea and, at the same time, the North Sea!
During the summer months, it is often completely gone. At most, some Danube water still passes the Danube seepage area through the two diversion tunnels near Immendingen and Fridingen at certain water levels. Sometimes, however, nothing at all. Then, if you will, Vienna is actually no longer located on the Danube—but on the Krähenbach stream from the Möhringen district of Tuttlingen, the first tributary after the first full seepage point!
The Danube Infiltration Site 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
