Delago-odú is a small but striking cave on the Oszoly ridge in the Pilis Mountains, famous for its impressive, oval entrance that can be spotted from a considerable distance. It is one of the more memorable features described in local hiking guides.

The cave opens in a rock face known as the Delago wall, formed from white, densely bedded Dachstein limestone from the Upper Triassic period, likely shaped by thermal water activity long ago. Inside, the cave is dry and free of sediment, narrowing upward into a small chimney that is sometimes home to a bird of prey. The surrounding Oszoly area is a popular rock-climbing destination wrapped in forest, offering pleasant views over the Csobánka countryside — especially atmospheric in the golden light of autumn or the fresh greens of spring.

How to get there

• Csobánka (Margit-liget) — approach through the forest on the Oszoly slopes, requiring some easy rock climbing, difficulty: moderate
• The entrance itself is reached via a short stretch of easy scrambling

Practical information

• Located within the Danube-Ipoly National Park
• The cave is occasionally used by a large bird of prey — feathers, droppings and small mammal bones can be found near the chimney
• It lies off the well-trodden climbing routes, so it is rarely visited up close

The name Delago-odú only appeared in scientific literature in 1981, even though the cave had already been surveyed and mapped since the late 1960s.