Zsó Cave is a small cave tucked into the Oszoly massif in the Pilis Mountains, within the Danube-Ipoly National Park. It's a spot for those who want to dig a little deeper into this landscape - literally - and discover a piece of the underground world long known to local climbers and cavers.

The entrance sits at the base of a rock face, below the so-called Kis-áthajlás, facing west. The cave stretches 12 metres in length and reaches 2.5 metres in height, formed in white Upper Triassic Dachstein limestone. Just past the entrance, the passage narrows into a very tight crawlway - the remnant of what was once an active spring cave. Inside, it's dry, with a stony, humus-covered floor and calcite filling the cracks. The surrounding Oszoly area is a scattering of rock outcrops among the forest, popular with rock climbers and scenic throughout the year, especially in autumn and spring.

How to get there

• Csobánka, Margit-liget — near the Oszoly climbing school area, on foot, moderate difficulty (rocky terrain requiring careful orientation)
• Landmark: about three metres from the Odúsor rock formation, below the Kis-áthajlás overhang

Practical information

• Basic caving equipment recommended
• Knee pads are advisable due to the narrow crawlway
• Located within a national park

The name Zsó Cave first appeared in the literature in 1971, though the cave had been known earlier under names such as Oszolyi-rókalyuk and Oszolyi-rókaluk. It remains a quiet, untouched corner of the Pilis underground.