An easy riverside loop to the famous Donauversickerung, the geological point near Immendingen where the Danube seeps through porous limestone into the Aachtopf and resurfaces in the Rhine system rather than the Black Sea
The Donauversickerung Trail is an easy 5 km loop near Immendingen, in the Danube valley, that visits the Donauversickerung, the point where the young Danube seeps through porous limestone into the ground and resurfaces in the Aachtopf spring, feeding the Rhine system rather than the Black Sea. The trailhead car park sits on Hindenburgstraße; Immendingen train station is a 15-minute walk away, giving good rail access without a car. The loop gains only about 80 m cumulatively, an easy outing suitable for all ages and completed comfortably in 1.5 hours. The path follows a flat, well-maintained riverside track through open meadow habitat, with informational geology markers explaining the sinkhole phenomenon along the way; there is minimal shade, so sun protection is worth carrying in summer. The main landmark is the Donauversickerung viewing platform overlooking the point where the riverbed runs dry in low-water periods, which also serves as the natural highlight and turnaround point of the loop. There are no refuge huts on this short route, and none are needed given its length; Immendingen town, a short walk away, has cafes and shops. The dry riverbed effect is most visible in late summer or after extended dry spells, when the Danube's flow drops enough for the porous limestone bed to fully absorb the water.
| Distance | 5 km loop (3.1 miles) |
|---|---|
| Duration | 1.5 hours |
| Difficulty | Easy |
| Trailhead | Immendingen train station, 15-minute walk to the Donauversickerung site |
| Best season | Year-round; the sinkhole effect is most visible in late summer |
| Address | Trailhead: Donauversickerung car park, Hindenburgstraße, 78194 Immendingen |
Trail facts
- Trail area
- Immendingen, where the Danube seasonally vanishes underground
What to bring
- Comfortable walking shoes
- Water
Weather through the year in Germany
Best time Shoulder Worth avoiding
Average daytime temperature in °C. Figures are for Germany.
Location
Trailhead: Donauversickerung car park, Hindenburgstraße, 78194 Immendingen
47.9375, 8.7325 View on map
Highlights
- Danube sinkhole (Donauversickerung) viewing platform
- Informational geology trail markers
- Riverside meadow habitat
Tips for visiting
- Visit in late summer or a dry spell when river levels are low, as this is when the sinkhole effect and dry riverbed are most dramatic
When to visit
Year-round, but a visit during a late-summer dry spell offers the best chance to see the dramatic dry riverbed and sinkhole effect.
Accessibility
The trail follows a flat, well-maintained riverside track and is largely suitable for wheelchair users and strollers, though surface conditions near the viewing platform should be checked locally in wet weather.
Frequently asked questions
What makes the Donauversickerung near Immendingen unusual?
It is the point where the Danube seeps through porous limestone into the ground, resurfacing at the Aachtopf spring and flowing into the Rhine system instead of the Black Sea.
How difficult is the Donauversickerung Trail?
It is an easy 5 km loop with only about 80 m of cumulative elevation gain, suitable for all ages and completed in around 1.5 hours.
When is the best time to see the sinkhole effect?
Late summer or after a dry spell shows the effect most dramatically, when low river levels allow the limestone bed to fully absorb the Danube's flow.
Is the trail accessible without a car?
Yes, Immendingen train station is about a 15-minute walk from the Donauversickerung trailhead.