Northern Dobruja is the part of Dobruja within the borders of Romania. It lies between the lower Danube River and the Black Sea, bordered in the south by Southern Dobruja, which is a part of Bulgaria.

Dobruja or Dobrudja is a geographical and historical region in Southeastern Europe 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, the Romanian coast, and the northernmost part of the Bulgarian coast. The territory of Dobruja is made up of Northern Dobruja, which is a part of Romania, and Southern Dobruja, which is a part of Bulgaria.