An unusually attractive tourist and recreation area in Bohemian Paradise. Here in the 16th century, people built a system of ponds from the valley floodplain and the marshes to utilise the territory economically and today, it forms a space of extraordinary scenic and natural value. The unique canyon valley is bordered by sandstone cliffs and these also often form the shores of the ponds. We count eight of them: Vidlák with a restaurant, parking lot and campsite; Krčák; Rokytnický and Hrůdka; the shallow Dolský, Podsemín and two of the most sought after "swimming holes" - Nebák and Věžák. Nature Preserve Podtrosecká údolí (The Podtrosecká Valley) protects the most extensive complex of marsh biotopes in the Bohemian Paradise.