Varna is the third-largest city in Bulgaria and the largest city and seaside resort on the Bulgarian Black Sea Coast. Situated strategically in the Gulf of Varna, the city has been a major economic, social and cultural centre for almost three millennia. Varna, historically known as Odessos (Ancient Greek: Ὀδησσός), grew from a Thracian seaside settlement to a major seaport on the Black Sea.