Rezovo River

Rezovo River (Резовска река / Mutludere)
File:Rezovo, BUL - border with Turkey 2.JPG The Bulgarian-Turkish border at the Rezovo River mouth
Origin	Istranca mountain, Turkey
Mouth	Black Sea, Bulgarian-Turkish border
Basin countries	Turkey, Bulgaria
Length	112 km
Basin area	738 km²

The Rezovo River (also Rezovska River, Rezvaya and Rezve; Bulgarian: Резовска река, Rezovska reka; Turkish: Mutludere) is a river in southeasternmost Bulgaria and northernmost (European) Turkey. The river is situated in Bulgaria's Strandzha Nature Park.

112 km in length, it takes its source from 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 River's whatershed spreads over 738 km², of which 555 in Turkey. Its largest tributary is the Velika.

The border at the Rezovo River'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.