The starting point for the visit of the Planina Cave is located in the immediate vicinity of the Ravbar Tower, in the village of Planina which is 26 kilometres away from the town of Postojna. The red-line shuttle bus will bring you directly to the Ravbar Tower; otherwise, you can also take the Castle Cycling Trail which will allow you to explore both the Haasberg Castle and the Ravbar Tower.
The Planina Cave (previously also known as the Malograjska Cave) is located on the southern edge of Planinsko polje, in the immediate vicinity of the Ravbar Tower.

It consists of various halls, numerous wonderful lakes, and stalactites. The cave which is nearly 7 kilometres long is considered as the largest water cave in Slovenia.

Another one of its important features is one of the largest confluences of underground rivers in Europe. Here, the Rak River coming from Rakov Škocjan and the Pivka River flowing from the Postojna Cave merge to form the Unica River.