Hirlatzhöhle

The Hirlatzhöhle is a cave in the Dachstein massif in the municipality of Hallstatt in the Upper Austrian part of the Salzkammergut. The total length of the cave known to date is over 115 km. It is therefore the third longest cave in Austria and, at 1559 m deep, the second deepest cave in Austria. The deepest point is at 443 m above sea level and therefore 65 m below the water level of the nearby Hallstättersee. It is the 21st longest cave in the world.