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|Nestos (Νέστος), Mesta (Места)|
|Countries||Bulgaria and Greece|
|• location||Rila Mountains, Bulgaria|
|• elevation||2,240 m (7,350 ft)|
|Aegean Sea opposite Thasos, Greece|
|Length||230 km (140 mi)|
|Basin size||5,184 km2 (2,002 sq mi)|
|• location||Hadzhidimovo, Bulgaria|
|• average||29.85 m3/s (1,054 cu ft/s)|
Nestos (Greek: Νέστος [ˈnestos]), Mesta (Bulgarian: Места [ˈmɛstɐ]), or formerly the Mesta Karasu in Turkish (Karasu meaning "black river"), is a river in Bulgaria and Greece. It rises in the Rila Mountains and flows into the Aegean Sea near the island of Thasos. It plunges down towering canyons toward the Aegean Sea through mostly metamorphic formations. At the end, the main stream spreads over the coastal plain of Chrysoupolis and expands as a deltaic system with freshwater lakes and ponds forming the Nestos delta. The length of the river is 230 km (140 mi), of which 126 km (78 mi) flow through Bulgaria and the rest in Greece. Its drainage area is 5,184 km2 (2,002 sq mi), of which 66% in Bulgaria. It forms some gorges in Rila and Pirin.
The Mesta's longest tributary is the Dospat (or Despatis). The banks of the river are covered mainly by deciduous trees that extend into halfway between Bulgaria and Greece where it forms the modern boundary of Greek Macedonia and Thrace, as well as the boundary between the Kavala and the Xanthi regional units, having first crossed the Drama regional unit. The river later forms a delta to the north where swamplands, wetlands and a lagoon once existed except in the east.
Because of its flow between canyons and inaccessible mountain areas, Nestos was not navigable in antiquity and also did not offer a natural terrestrial road along the riverbed. Concerning the horizontal communication from the East to the West, the river had only two passes, one in the middle and the other in the lower watercourse, which were controlled respectively by the cities of Nicopolis and Topeiros. The first pass, near Nicopolis, allowed the communication between the valleys of the rivers Strymon and Hebros (Evros), while through the second pass, near Topeiros, passed an ancient road (and later the Roman road of Via Egnatia) that served the communication between the East and the West. In Nestos' valley (east bank) north of the south pass, the Dii used to live, while Satrae were living to the south. Finally, Nestos played an important role in the urban and economic history of the inhabitants of the estuary, where the city of Abdera and later Topeiros, founded by the Emperor Trajan. This is presumed by the deification of the river and its depiction on coins of the imperial period.
- Statistical Yearbook 2017, National Statistical Institute (Bulgaria), p. 17
- Preliminary Flood Risk Assessment Archived 2017-12-09 at the Wayback Machine, Ministry of Environment, Energy and Climate Change, p. 90
- Geography of Claudius Ptolemy, Book 3, Chapter 11
- D. C. Samsaris, Historical Geography of Western Thrace during the Roman Antiquity (in Greek), Thessaloniki 2005, p. 33-36
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