The river Vltava flows in sector between Antýgl to Čeňkova Pila wildly through romantic valley. The area is natural reserve and is called Povydří (Vydra valley). Many rapids and cascades are formed in the rocky bed of the river. Numerous so-called giant´s cups originate due to the erosive activity of the water and sand. Quite a number of them can be seen at Antýgl. Several stone seas have been preserved on the slopes of the river.