Baia (the ancient Baiae) is a hamlet of Bacoli, municipality of themetropolitan city of Naples and part of the Phlegraean Fields.
Its gulf, enclosed by the elevations of Punta Lanterna on the south end(on which rises the Aragonese Castle ) and Punta Epitaffio on the north end, itis an ancient volcanic crater that goes about 8,400 years back and onlyhalf of it is left, since its eastern side collapsed into the water or it hasbeen eroded by the sea.

Home to the biggest plant of the region for the purification of shellfish,Baia owes its fame mostly to the presence of archeological ruins ofgreat historical and artistic value.
According to the legend, its name comes from Bajos, helmsman ofUlisse, here buried. During the Roman Time, as testified by rich villas, itwas a place for resting and vacation, popular among the RomanPatricians. The resort was in fact renowned for its hot spring waters,sought-after for luxury and to cure some diseases.
Bacoli is the first municipality situated at north-west of the Phlegraeanpeninsula, on the Gulf of Pozzuoli, and it includes the ancient Greek-Roman resorts of Baia, Fusaro, Miseno, Cuma, as well as Miliscola (from militumschola), home to the ancient fleet of the Roman Emperors. The historiccenter and the Municipal Gardens are characteristic and inviting places
of immense beauty. Worth to mention is also the area of Fusaro, hometo the Fusaro Lake and the little Vanvitellian house.