From north to south, those groups are the Danubian Plateau, the Balkan Mountains (called Stara Planina, which means old mountains in Bulgarian), the focal Thracian Plain, and the Rhodope Mountains.
Ukusuka enyakatho kuye eningizimu, lawo maqembu yiDanubian Plateau, izintaba zaseBalkan (ezibizwa ngeStara Planina, okusho ukuthi izintaba ezindala ngesiBulgaria), iTrracian Plain egxile kakhulu, kanye nezintaba iRhodope.