Eisriesenwelt

a karst grotto in Austria, in the Tennengebirge, 35 km southeast of Salzburg. Eisriesenwelt measures 42 km in length and 407 m in depth. The entrance to the grotto lies at an elevation of 1,641 m, 1,120 m above the bottom of the valley of the Salzach River. For a length of 2 km from the entrance there is an abundant accumulation of ice, which gave the name to the grotto, “giant ice world” in German.