The valley of the Karpenisiotis river - about 30 km long - lies between Karpenisi and Prousos. Initially a wide green valley, slowly but surely the Helidona en Kaliakouda mountains on both sides of the valley with plane tree forests become higher and more impressive. The area is not called Greek Switzerland for nothing.

A few kilometres after the village of Gavros, the scenery becomes spectacular and the natural beauty reaches it peak. The road along the river becomes narrower and the cliffs in the Kleidi Gorge (PiP1) almost touch. The road passes here with a rocky overhang.

After this natural wonder, the valley widens and soon the Prousos Monastery comes into view.