Petřínské skalky, Natural monument in Malá Strana, Czech Republic.

Petřínské skalky is a protected natural monument covering 52.5 ha on the upper slopes of Petřín hill, from the top of Kinský Garden through the Petřín and Seminary gardens to Strahov Monastery. Its core is sandstone rock formations and small stone quarries in Ordovician shale and Cretaceous sandstone, set among acid oak and oak-hornbeam woodland.

The Petřínské skalky area was declared a protected area on 1 September 1988 by the Prague national committee, to safeguard the natural character of the slopes, the original forest communities and the sandstone rock formations with their secondary fossils. In 2013 the territory was enlarged and renamed Petřín, covering 52.5 ha, with the stag beetle (Lucanus cervus) added as a protection target.

The gardens here are named after their historical owners and uses: Kinský Garden, the Seminář Gardens, the Strahov and Lobkovic gardens. Since 1891 serpentine paths were laid out to open the slopes to visitors, and green areas between the paths were replanted so that views of Prague's historic core stayed open.

The protected area can be accessed through multiple entry points across different city districts, with a network of paths guiding visitors through the various sections. Comfortable shoes are recommended since the terrain is uneven and wooded in places.

The stag beetle (Lucanus cervus) is the reason the area was enlarged and renamed in 2013: its larvae develop in fallen branches, dead trees and stumps, so these are deliberately left lying in place. Fallen wood also supports other plants and animals tied to decaying timber.