Ahtopol is a town and seaside resort on the southern Bulgarian Black Sea Coast. It is located on a headland in the southeastern part of Burgas Province and is close to the border with European Turkey. It is the southernmost town on the Bulgarian coast.
The town lies on the site of an ancient Thracian settlement, with the earliest traces of human settlement dating to the Neolithic. It was probably colonized by the Ancient Greeks around 430 BC. The Romans called it Peronticus, while the Byzantine leader Agathon reconstructed the town after barbarian invasions and possibly gave it his own name, Agathopolis. According to other sources, it was named thus as early as 323 BC.