Bulgaria | History, Language, & Points Of Interest | Britannica

Relief

Within a relatively small compass, the Bulgarian landscape exhibits striking topographic variety. Open expanses of lowland alternate with broken mountain country, cut by deep river gorges and harbouring upland basins such as that in which Sofia lies. Three basic structural and physiographic divisions run east-west, splitting the country into the traditional regions of North Bulgaria, including the Danubian Plain and the Balkan Mountains; South Bulgaria, including the Rila-Rhodope Massif; and a transitional area between them.

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North Bulgaria

All but a short section of the northern frontier of Bulgaria is marked by the lower Danube River. The abrupt and often steep banks on the Bulgarian side contrast with the swamps and lagoons of the Romanian side. Extending southward from the Danube to the foothills of the Balkan Mountains is the fertile, hilly Danubian Plain. The average elevation of the region is 584 feet (178 metres), and it covers some 12,200 square miles (31,600 square km). Several rivers cross the plain, flowing northward from the Balkans to join the Danube. The Balkan Mountains border the Danubian Plain on the south. Their rounded summits have an average height of 2,368 feet (722 metres) and rise to 7,795 feet (2,376 metres) at Mount Botev, the highest peak.

Transitional region

The mountain chain is larger than the adjacent ranges that run parallel in a transitional region of complex relief. Block faulting—the raising or lowering of great structural segments along regular lines of crustal weakness—has produced there the Sredna Mountains, the Vitosha Massif near Sofia, a number of sheltered structural basins, and the Upper Thracian and Tundzha lowlands.

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South Bulgaria

Another mountain mass covers southern Bulgaria. This includes the Rhodope Mountains (Bulgarian: Rodopi; Greek: Rhodopis), which rise to 7,188 feet (2,190 metres) at Golyam Perelik Peak; the Rila Mountains, rising to 9,596 feet (2,925 metres) at Musala Peak, which is the highest point in the country and indeed in the whole Balkan Peninsula; the Pirin Mountains, with Vikhren Peak reaching 9,560 feet; and a frontier range known as the Belasitsa Mountains. These majestic ranges discharge meltwater from montane snowfields throughout the summer, and their sharp outlines, pine-clad slopes, and, in the Rila and Pirin ranges, several hundred lakes of glacial origin combine to form some of the most beautiful Bulgarian landscapes.

Coastal region

Trending north-south at the eastern fringe of three principal regions is the narrow Black Sea coastal region. With the exception of the fine harbours of Varna and Burgas, the coast has few bays, but it does have extensive stretches of sandy beach that are features of a number of picturesque seaside resorts.