page_title: Aachtopf
section_title: Fauna
hierarchical_section_title: Aachtopf / Fauna
caption_attribution_description: Deutsch: Blick in den Aachtopf, wasserreichste Karstquelle Deutschlands, Quelle der Radolfzeller Aach. Panorama aus 3 Fotos English: karst spring Aachtopf, source of the river Radolfzeller Aach in Baden-Württemberg, Germany. 3 pictures stitched
context_page_description: The Aachtopf is Germany's biggest karst spring, located south of the western end of the Swabian Jura, near the town Aach. It produces an average of 8,500 litres per second. Most of the water stems from the River Danube where it disappears underground at the Danube Sinkhole, 12 km North near Immendingen and about 14 km North near Fridingen. The cave system has been explored since 1960´s, but as of 2020 only a small part has been discovered due to a large blockage after a few hundred meters.
context_section_description: In 2015, the only known cavefish in Europe, a Barbatula loach,  was discovered in the Danube—Aachtopf system.
caption: Panorama
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