Relief and natural resources:

Bulgaria comprises portions of the separate regions known in classical times as Moesia, Thrace, and Macedonia.
About 30% of the land is made up of plains, while plateaus and hills account for 41%.The mountainous southwest of the country has two alpine ranges Rila and Pirin and further east stand the lower but more extensive Rhodope Mountains. The Rila range includes the highest peak of the Balkan Peninsula, Musala, at 2,925 meters (9,596 ft); the Balkan mountain chain runs west-east through the middle of the country, north of the Rose Valley. Hilly countryside and plains lie to the southeast, along the Black Sea coast, and along Bulgaria's main river, the Danube, to the north. Strandzha forms the tallest mountain in the southeast. Few mountains and hills exist in the northeast region of Dobrudzha.