a range of mountains stretching east across Bulgaria from the Serbian frontier to the Black Sea. The highest point is Botev Peak (7,793 feet; 2,375 m).
the countries occupying the part of southeastern Europe that lies south of the Danube and Sava rivers and forms a peninsula bounded by the Adriatic and Ionian seas in the west, the Aegean and Black seas in the east, and the Mediterranean Sea in the south.