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Dobruja or Dobrudja (US: /ˈdoʊbrʊdʒə/; Bulgarian: Добруджа, romanized: Dobrudzha or Dobrudža; Romanian: Dobrogea, pronounced [ˈdobrodʒe̯a] (listen) or [doˈbrodʒe̯a]; Turkish: Dobruca) is a historical region in the Balkans that has been divided since the 19th century between the territories of Bulgaria and Romania. It is situated between the lower Danube River and the Black Sea, and includes the Danube Delta, Romanian coast, and the northernmost part of the Bulgarian coast. The territory of Dobruja is made up of Northern Dobruja, which is part of Romania, and Southern Dobruja, which is part of Bulgaria.

The territory of the Romanian region Dobrogea is organised as the counties of Constanța and Tulcea, with a combined area of 15,588 km² (6,019 sq mi) and a population of slightly less than 900,000. Its main cities are Constanța, Tulcea, Medgidia and Mangalia. Dobrogea is represented by dolphins in the coat of arms of Romania.

The Bulgarian region Dobrudzha is divided among the administrative regions of Dobrich and Silistra; the following villages of Razgrad Province: Konevo, Rainino, Terter and Madrevo; and the village General Kantardzhievo (Varna). This section has a total area of 7,566 km² (2,921 sq mi), with a combined population of some 310,000 people, the main towns being Dobrich and Silistra (regional seats).