Debelt is a village in Sredets Municipality in Burgas Province in southeastern Bulgaria, about 17 kilometers south-west from Burgas. It has a population of 1,574 and an altitude of 46 meters. The village was founded around the 2nd century by the Roman emperor Vespasian. Then called Deultum, it was the only Roman colony on Bulgarian land in the Flavian dynasty. During the Byzantine era it was known as Develtos (Greek: Δεβελτός).