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There are 540 rivers in Bulgaria. [1] The longest river in Bulgaria is the Danube (2,888 km), which spans most of the country's northern border for a length of 470 km. The longest one to run through the country (and also the deepest) is the Maritsa (480 km), while the longest river that runs solely in Bulgaria is the Iskar (368 km).
The Ogosta (Bulgarian: Огоста [oˈɡɔstɐ], Latin: Augusta), is the largest river in Northwestern Bulgaria, a right tributary of the Danube.It originates at Chiprovska Mountain, 2,168 meters high section of the Western Balkan Mountains, at about an altitude of 1,760 meters, [1] [2] on the border with Serbia.
As it emerges out of the valley the river fills the Iskar Reservoir, the largest artificial lake in Bulgaria. [13] [16] Downstream of the dam the Iskar flows in north-western direction and forms the 22 km long Pancharevo Gorge that divides the Vitosha and Plana Mountains in the west and the Sredna Gora mountain range in the east. [17]
It can be thought of as a list of the biggest rivers on Earth, measured by a specific metric. For context, the volume of an Olympic-size swimming pool is 2,500 m 3 (88,000 cu ft). The average flow rate at the mouth of the Amazon is sufficient to fill more than 83 such pools each second.
The Osam (Bulgarian: Осъм) is a river in northern Bulgaria, a right tributary of the Danube. Its length including the main stem Cherni (Black) Osam is 314 km, making it the fifth longest river in Bulgaria. The river proper, formed by the confluence of the Cherni and Beli (White) Osam, is 278 km. [1]
However, the path along the river's deepest point is fractal in the same way that the coastline is. Even when detailed maps are available, the length measurement is not always clear. A river may have multiple channels, or anabranches. The length may depend on whether the center or the edge of the river is measured.
It is the longest and the largest tributary of the Arda, the main river of mountain range, itself a tributary of the Maritsa. [2] [3] The Varbitsa is Bulgaria's most temperamental river, with up to 5,000 times difference in water volume between spring highs and autumn lows, with frequent massive flooding and erosion as a result. [2]
Zlatna Panega's source is the largest Karst source in Bulgaria and the water temperature is relatively constant throughout the year. Although the Zlatna Panega is only several dozen kilometres in length, it runs through the villages of Zlatna Panega, Rumyantsevo, Petrevene and the town of Lukovit before emptying into Iskar River.