The
Nestos or
Mesta , 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.