The most beautiful natural sites to discover Postojna

It would be the only cave in the world where two rivers meet. Pivka and Rak are indeed mixing to give birth to Unica. The new course disappears to better reappear in Vrhnika, now called Ljubljanica. The cave is home to many proteins, eels and other aquatic salamanders. Some 7 km long, it can be visited on foot (a small 1-hour tour) or by boat (a 4-5-hour tour), using lamps because it is not lit.