奈斯托斯河(希腊语: Νέστος) ，一条流经保加利亚与希腊两国的河流。发源于里拉山脉的科拉罗夫峰(Kolarov)，注入在萨索斯岛附近的爱琴海海域。全长230公里，其中126公里位于保加利亚。

The Nestos (Greek:Νέστος) or Mesta (Bulgarian:Места), formerly the Mesta Karasu (Ottoman Turkish), 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, of which 126 km in Bulgaria and the rest in Greece. It forms some gorges in Rila and Pirin.