The Slovenian cave traditionally identified as the type locality of the blind salamander Proteus anguinus is Postojna Cave.
Postojna Cave is a large limestone karst system near the town of Postojna in southwestern Slovenia. It was formed by the Pivka River and is closely associated with the olm, a pale, cave-dwelling salamander also called the “human fish” because of its flesh-colored skin. The animal’s blindness, lack of pigmentation, and aquatic lifestyle reflect adaptation to permanent darkness.
The olm has a long scientific and cultural history. Local people once interpreted specimens washed out by heavy rain as dragon larvae. Austrian naturalist Josephus Nicolaus Laurenti formally named Proteus anguinus in 1768, although the animal was not immediately understood as a specialized cave species. Postojna’s olm populations later helped make the cave a landmark in biospeleology, the study of life in caves.
Postojna is also famous for its tourism history: a new section was discovered in 1818, electric lighting arrived in 1884, and the cave railway began operating in the nineteenth century. The broader species range extends through karst groundwater systems of the Dinaric Alps, so the cave is not the olm’s only habitat.