Caserta - WWF Oasis Oasi WWF Bosco di San Silvestro The WWF Bosco di San Silvestro Oasis in 1993 was established as a natural area and is located between the hills of Montemaiulo and Montebriano. The area covers 76 hectares and turns out to be the first WWF oasis in the province of Caserta. The flora is composed of numerous ferns and green plants, while the fauna has numerous different species including the deer and the roe deer.