Varbitsa (river)

Varbitsa
The Varbitsa near Zlatograd
Location
CountryBulgaria
Physical characteristics
Source 
  locationnear Margagyan Peak, Rhodope Mountains
  coordinates41°24′38.88″N 24°55′6.96″E / 41.4108000°N 24.9186000°E / 41.4108000; 24.9186000
  elevation1,284 m (4,213 ft)
Mouth 
  location
Studen Kladenets reservoir
  coordinates
41°36′8″N 25°26′8.16″E / 41.60222°N 25.4356000°E / 41.60222; 25.4356000
  elevation
227 m (745 ft)
Length98 km (61 mi)
Basin size1,203 km2 (464 sq mi)
Basin features
ProgressionArdaMaritsaAegean Sea

The Varbitsa (Bulgarian: Върбица [vɐrˈbit͡sɐ]) is a 98 km long river in the eastern Rhodope Mountains in southern Bulgaria. It is the longest and the largest tributary of the Arda, the main river of mountain range, itself a tributary of the Maritsa. 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. Its middle and lower valley is considered the boundary between the western and the eastern Rhodopes.