Pod Žvahovem

Pod Žvahovem is a small but geologically remarkable nature monument in Prague's Hlubočepy district, sitting right next to the Prokopské údolí valley. Covering barely half a hectare at an elevation of 195–210 metres, it has drawn geologists, botanists and entomologists for decades despite its modest size.

What is actually here?

At the heart of the site is a south-facing, rocky limestone slope cut through by a railway line. The exposure created alongside the tracks reveals one of the most distinctive geological profiles anywhere near Prague. Layers of nodular limestone from the Zlíchov formation were folded here into a shape that, in cross-section, resembles a giant letter A — a structure geologists call an anticline. For anyone interested in earth sciences, it's a textbook illustration of the tectonic forces that shaped the Czech landmass in ancient times.

Why was it protected?

The area was declared a protected natural monument in 1968 for three main reasons. First, the rock layers contain numerous fossils, evidence of organisms that once lived here when a shallow sea covered what is now the Prague area. Second, the sun-facing slope harbours rare plant species that have long since disappeared from most other parts of the city as urban development spread. Third, the dry, warm scarp provides habitat for heat-loving invertebrate species that increasingly struggle to find suitable ground elsewhere.

Vegetation on the rocky slope

The slope's southern exposure makes it hot and dry in summer, conditions that favour plants adapted to rocky, arid habitats. Fescues dominate — including sheep's fescue and Walliser fescue — while feather grass and various sedge species are becoming increasingly common. Together they form a community typical of warmth-loving rock grasslands, a rare sight within a large city.

Getting there and visiting tips

Pod Žvahovem lies along hiking and cycling routes connecting Hlubočepy with Prokopské údolí, making it easy to combine a visit with a longer walk through one of Prague's most interesting natural valleys. Keep in mind that this is a strictly protected area — visits should stick to marked paths, without climbing onto the rock exposures or disturbing the vegetation.

For anyone curious about geology, this is one of those Prague spots where a few minutes beside the railway tracks reveal more than an entire museum exhibit — a living, exposed record of the region's deep past.

Frequently asked questions

Can visitors enter the reserve? Yes, the area is accessible on foot, but because of its protected status visitors should stay on marked paths and avoid disturbing the rocks or plant life.

What is the main attraction at Pod Žvahovem? The geological exposure beside the railway line, where limestone layers form a clearly visible fold (an anticline) shaped like the letter A.

When is the best time to visit? Spring and early summer, when the heat-loving plants on the rocky slope are in bloom and the invertebrate species typical of this habitat are most active.

Is the reserve part of a larger protected area? It lies close to the Prokopské údolí reserve, so both can easily be combined into a single walking route.