Bulgaria Rent a car in Bulgaria. Cheap car rentals deals. Economy Rent-a-car Bulgaria is a country in southeastern Europe. It is bordered by Romania to the north, Serbia and Macedonia to the west, Greece and Turkey to the south, and the Black sea to the east. Two mountain ranges and two great valleys mark the topography of Bulgaria, a country the size of Tennessee and situated on the Black Sea. The Maritsa is Bulgaria's principal river, the Danube also flows through the country. The capital of Bulgaria is Sofia, which is also its largest city Travelers flying into Bulgaria will want to rent a car to see the many sights and sounds this country has to offer. Economy Rent A car serves the Burgas Airport (BOJ), and offers customers a wide variety of vehicles to select from. Whether you need a small economical car or a larger vehicle for the family, be sure to check out the great prices and great vehicles at Economy Rent A Car.