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Burgas (or Bourgas, Bulgarian: Бургас) is the second largest city on the Bulgarian Black Sea coast. It is also the fourth largest city in the country, following Sofia, Plovdiv and Varna. Burgas is an industrial and tourist center. Burgas International Airport is a connecting point to major Black Sea resorts in Bulgaria like Sunny Beach, Nessebar, Sozopol, Dyuni, Roman city of Deultum (later named Develt), founded by Kastiacion, Skafida and Rossokastron. In the Middle Ages a small fortress called List of cities in Bulgaria