It encompasses the area between the Danube River, which forms most of the country's northern border, and Stara Planina to the south.
Ọ na-agụnye ókèala dị n'etiti Osimiri Danube, nke na-akpụ akụkụ ka ukwuu nke mgbago ugwu nke mba ahụ, na Ugwu Balkan na ndịda.