Balkan mountain range
Varna
Stara Planina
the stara planina mountains
The Appenines mountain range runs through most of the Italian Peninsula.
The Balkan mountain range runs from the border with Serbia 560km eastwards to the Black Sea
These are the Carpathian Mountains.
Its the Danube river and Danube plain separates Romania and Bulgaria. There are no mountaneous border between the mentioned two countries. And Carpathian mountain range of Romnia or Balkan mountain range (most northern mountains of Bulgaria: none of them serves as border.
pindus mountains
The Balkan Mountain range (in Bulgaria Balkan Mountain is often called the 'Stara Planina' Mountains)
that is the apennines that is right in the center of Italy.
The Stara planina mountain (Стара планина)
Balkan mountain range, The Daniube and a capital Sofia!