Pašijová draha, Nature reserve near Libušín, Czech Republic.

Pašijová draha is a nature reserve characterized by deep canyons carved by water erosion, exposing layers of sedimentary rock. The landscape displays travertine formations and calcareous deposits, with natural openings that reveal underground cavities beneath the surface.

The reserve was designated in 1987 to protect a sandstone and marl relief from the Upper Cretaceous, about 90 million years old, where water erosion cut canyon-like valleys. It lies in the Mrákava forest area and forms part of the Džbán nature park, though geomorphologically it belongs to the western edge of the Prague Plateau.

The name Pašijová draha refers to the Passion, echoing the stations of the cross once walked here; the slope above the Knovízský potok was a pilgrimage route. A green-marked trail from Kamenné Žehrovice station to Libušín follows the reserve's eastern edge, and a yellow route from Rozdělov to Smečno passes its southern border.

The reserve can be reached using paths that connect the surrounding villages and provide access to the protected area. Since no marked trails run through the reserve itself, visitors should use the surrounding paths and respect the boundaries of the protected zone.

Ventaroles here are holes in the ground from which air of roughly stable temperature flows out in winter; they are among the pseudokarst phenomena the reserve protects. Because they are easily damaged by logging and heavy visitation, the reserve also holds a cabin of nature conservationists.