Riesending cave
The 9th longest cave in the world
19.5km · Length
The Riesending Cave (German: Riesending-Schachthöhle) is a pit cave in the Untersberg near Berchtesgaden, Germany, and Salzburg, Austria. At 1,148 m it is the deepest and at 19,300 m the longest cave in Germany. It was discovered in 1996. In June 2014 it became well known because of a large effort to rescue a lead speleologist.
Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).