The Gulf of Baratti is a gulf that opens at the southeastern end of the Ligurian Sea, located at the northern end of the municipal area of ​​Piombino.

The gulf takes its name from the town of Baratti, located at the southern end, near which there are Etruscan burial mounds. It is bordered to the north by the modest headlands of Poggio San Leonardo, while to the south it is closed by the tower of Baratti, which precedes the northern slopes of the promontory of Piombino from which it dominates the medieval center of Populonia.
The inlet is characterized by a sandy beach, more extensive in the central-northern part of the gulf, which tends to be considerably reduced towards the southern end of the port of Baratti. The seabed is low, while the sandy shore is characterized both by golden and amber colors, and by the presence of iron slag, remnants of the processing of this metal during the Etruscan period.

In some sections the gulf develops a pine forest, characterized by the presence of maritime and domestic pines, which is interrupted both at the northern end of the inlet and in the central area where the necropolis develops. In the undergrowth there are numerous shrubs of the Mediterranean maquis. In the southern part, the pine forest gives way to other types of vegetation.

At the end of the 1980s, a wreck was found in the gulf dating back to the second century BC, in which, for the first time, it was possible to find traces of the medicines used in Roman times.