Neapolitan pizza (Italian: pizza napoletana) is made with tomatoes and mozzarella cheese. It must be made with San Marzano tomatoes, which grow on the volcanic plains to the south of Mount Vesuvius, and mozzarella Campana, the DOP version can be made with buffalo mozzarella cheese, 'Mozzarella di Bufala Campana' made with the milk from water buffalo raised in the marshlands of Campania and Lazio in a semi-wild state (this mozzarella is protected with its own European protected designation of origin).