Rocca di Papa is a small town and comune (municipality) in the Metropolitan City of Rome, Lazio, Italy. It is one of the Castelli Romani about 25 kilometres (16 mi) southeast of Rome on the Alban Hills. It is close to the other communes of Velletri, Rocca Priora, Monte Compatri, Grottaferrata, Albano and Marino. It is the center of the Regional Park known as the "Parco Regionale dei Castelli Romani".

Velletri is an Italian comune in the Metropolitan City of Rome, approximately 40 km to the southeast of the city centre, located in the Alban Hills, in the region of Lazio, central Italy. Neighbouring communes are Rocca di Papa, Lariano, Cisterna di Latina, Artena, Aprilia, Nemi, Genzano di Roma, and Lanuvio. Its motto is: Est mihi libertas papalis et imperialis.