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. It was discovered in 1996. In June 2014 it became well known because of a large effort to rescue a lead speleologist.
Egge (Wiehen Hills) The Egge, also called the Preußisch Oldendorfer Berg is a roughly seven-kilometre-long secondary ridge of the Wiehen Hills and gives its name to the Eggetal valley in the districts of Osnabrück and Minden-Lübbecke in North Germany. The state border between North Rhine-Westphalia and Lower Saxony divides the ridge at a pass called the "Durchbruch" ("breakthrough") over which the road from Preußisch Oldendorf runs into the Eggetal and to Bruchmühlen, about two-thirds of the Egge belonging to Westphalia.