Wikipedia
The Rezovo (also Rezovska, Rezvaya and Rezve; , Rezovska reka; ) is a river in the extreme southeast of Bulgaria and northernmost part of ( European) Turkey. The river is situated in Bulgaria's Strandzha Nature Park.
The Rezovo is 112 km long and its source is in the Turkish part of the Strandzha mountains east of Kofçaz under the name of Paspalderesi. It generally flows east and after Paspala becomes a border river between the two countries until its mouth in the Black Sea at Rezovo, which constitutes the southernmost point of the Bulgarian Black Sea Coast and the northernmost point of the Turkish one, as well as the southeasternmost point of Bulgaria and northeasternmost point of Turkish Thrace. The Rezovo's catchment spreads over 738 km², of which 555 km2 are in Turkey. Its largest tributary is the Velika.
The border at the Rezovo's mouth was the subject of a minor territorial dispute between Bulgaria and Turkey, which was settled in the 1990s. As a result of an agreement between the two countries of 6 May 1992 (ratified by Bulgaria in 1998), Bulgaria received a small land area of several square kilometres in the Rezovo Bay in return for water area in the continental shelf.
Rezovo (, pronounced ) is a village and seaside resort in southeastern Bulgaria, part of Tsarevo Municipality, Burgas Province, in the coastal Strandzha geographical region. The village is situated in Strandzha Nature Park. Lying at the mouth of the Rezovo River in the Black Sea, Rezovo is the southernmost point of the Bulgarian Black Sea Coast and the southeastern-most inhabited place in Bulgaria and the European Union mainland. The village is located 11 kilometres south of Sinemorets, 17 km from Ahtopol and 36 km from Lozenets. As the Rezovo River constitutes the border between Bulgaria and the European part of Turkey, Rezovo directly overlooks the Turkish bank of the river and the Turkish village of Beğendik, in Demirköy district, Kırklareli Province.