Mesta (Bulgarian: Места) or Nestos (Greek: Νέστος) is a river in Bulgaria and Greece. It rises in the Rila Mountains and flows into the Gulf of Tessaloniki in Aegean Sea near the island Thasos. The length of the river is 230 km. It forms some gorges in Rila and Pirin. Its longest tributary is the Dospat River. The banks of the river are covered mainly by deciduous trees that extend into halfway between Bugaria and Greece where it forms the today's boundary with Macedonia (Greece) and Thrace as well as the Kavala and the Xanthi prefectures. The river later forms into a delta to the north where swamplands, wetlands and a lagoon once existed except in the east. Rila Mountain, Bulgaria The Rila is a mountain range in western Bulgaria. ... Jump to: navigation, search The Aegean Sea. ... Thasos (Greek: ) or Thassos is the name of an island in the north of the Aegean Sea, off the coast of Thrace and the plain of the river Nestos (during the Ottoman times Kara-Su). ... Jump to: navigation, search Vihren from the south The Pirin Mountains (Bulgarian: Пирин) are a mountain range in southwest Bulgaria, with Vihren (2,914 m high) the highest peak, situated at 41° 45′ 50″ N, 23° 25′ 30″ E. The range extends about 40 km northwest-southeast, and about 25 km... Jump to: navigation, search Macedonia (Greek: Μακεδονία, IPA ) is the largest and second most populous region of Greece. ... Thrace (Greek Θρᾴκη ThrákÄ“, Bulgarian Тракия Trakija, Turkish Trakya) is a historical and geographic area in southeast Europe spread over southern Bulgaria, northeastern Greece, and European Turkey. ... Kavala prefecture (Greek: Νομός Καβάλας Nomos Kavalas) is a prefecture in eastern Macedonia. ... Xanthi (Greek: Ξάνθη) is a city in northern Greece, in the East Macedonia and Thrace periphery. ...