The massif that contains the Riesending cave borders Berchtesgaden, Germany and what Austrian city?
Riesending cave: The Riesending cave (German: "Riesending-Schachthöhle" ) is a pit cave in Untersberg and the deepest and longest in Germany. Untersberg: The Untersberg is the northernmost massif of the Berchtesgaden Alps, a prominent spur straddling the border between Berchtesgaden, Germany and Salzburg, Austria.
Salzburg