What city is the largest financial center in Europe ?
The region is composed of : Burgas Province , Dobrich Province and Varna Province in Bulgaria ( 16,300 km2 , 1,060,000 inhabitants ) Constanţa County and Tulcea County in Romania ( 15,600 km2 , 980,000 inhabitants ) The largest city is Varna , while Constanţa is the largest metropolitan area .