SAS-mountain natural reserve - part of the Danube-Polskiego national Park. An area of 30 acres (120,000 m2) on the top of the hill was taken under protection in 1958. It was one of the first reserves of Hungary. Primarily the state and society were concerned about its unique landscape of limestone rocks, as well as unique flora and fauna. From the top of the hill (altitude 257 m) offers a breathtaking view on Budskogo castle, Gellert hill and urban areas. Park service maintains a visitors ' Centre and the ring rail line 2350 m, which introduces visitors to the most important natural attractions of the reserve.