The name of the Struma River appears as early as in ancient Greek sources as “Strimon.” It is believed to be of Thracian origin, linked to the Proto-Indo-European root *sreu—“to flow, to stream.”
The Struma River’s drainage basin covers an area of 17,300 km² and encompasses parts of four Balkan countries—Bulgaria, Greece, North Macedonia, and Serbia. Bulgaria has the largest share, amounting to 10,797 km², which represents 9.73% of the country’s territory. With this area, the Struma River basin is the second largest in Bulgaria after that of the Maritsa River. It encompasses the entire Kyustendil Province, the western part of the Blagoevgrad Province, about 80% of the Pernik Province, and a very small part of the Sofia Province. It includes 21 Bulgarian municipalities, 18 of which are entirely within the basin and 3 of which are partially within it.
The topography of the Struma River basin is a diverse mosaic of mountains and valleys. It is the only river in Bulgaria for which we cannot speak of upper, middle, and lower reaches in the literal sense, because the average elevation of the middle reaches’ watershed is higher than that of the upper reaches.
Due to the favorable climatic conditions and convenient transportation links, the river’s course and its valley have been inhabited since ancient times. There are 48 settlements along the river itself, of which 43 are in Bulgaria—including 9 towns and 34 villages—and 5 villages are in Greece.
The Struma Valley is Bulgaria’s warmest and most distinctive wine-growing region. It is located in the southernmost part of the country and is significantly influenced by warm air currents. The hilly terrain, relatively poor soils, high annual temperatures, and generally dry climate determine the grape varieties that can be grown. These are almost exclusively red varieties. Merlot, Cabernet Sauvignon, and Shiroka Melnishka Loza—which has been emblematic of the region since ancient times—are widely cultivated. Shiroka Melnishka Loza is an exotic and very distinctive wine grape variety. Wines produced from it acquire a unique character after prolonged aging under suitable conditions in oak barrels.
Surface and groundwater in the Struma River basin and its tributaries are used for drinking, domestic, and industrial water supply to populated areas, as well as for irrigation and power generation. Irrigation in the Struma River basin has a long tradition. Some of the first water cooperatives in Bulgaria were established here. There are 14 hydroelectric power plants in operation. Water is drawn for the “Studena” hydroelectric power plant and the “Kalin” pumped-storage hydroelectric power plant from the reservoirs of the same name, which ensure annual flow equalization.
Since ancient times, the river valley has been used for the construction of roads and, later, rail lines. Sections of five roads from Bulgaria’s road network and sections of the routes of two major rail lines run through the river valley. These include the sections from Pernik to Radomir and then from Boboshevo to Kulata—part of the Sofia–Kulata railroad line—as well as the section from Radomir to Kyustendil on the Sofia–Gyueshevo railroad line.
Dozens of natural, archaeological, architectural, and tourist attractions are located along the river’s course. These include the picturesque cliffs in the Zemen, Skrin, and Kresna Gorges; the extinct Kozhuh volcano; the ruins of the medieval Krakra Fortress; the Kadin Bridge near the village of Nevestino, the Zemen Monastery, the “Rupite” area, and many others.
The river’s swift current during the spring months is ideal for rafting, which has been growing rapidly in recent years in the Kresna Gorge.
