Migovec System

The Migovec System (Sistem Migovec) is a 43,009-metre-long (141, 000 ft) and 972-metre-deep (3, 190 ft) Alpine cave system within Mount Tolmin Migovec (Tolminski Migovec) in the Municipality of Tolmin in northwestern Slovenia. The mountain and the cave system are part of Triglav National Park. The combined system is the longest known cave in the country, followed by the Postojna Cave System (24, 340 m or 79, 900 ft).

Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).