The
Struma or
Strymónas (
Bulgarian Струма, pronounced ,
Greek Στρυμόνας ,
Turkish (Struma) Karasu 'black water') is a river in
Bulgaria and
Greece. Its
ancient name was
Strymōn (
Greek: Στρυμών ). Its catchment area is 10,800 km². It takes its source from the
Vitosha Mountain in
Bulgaria, runs first westward, then southward, enters
Greek territory at the Kula village. In Greece it is the main waterway feeding and exiting from
Lake Kerkini, a significant centre for migratory wildfowl. The river flows into the
Strymonian Gulf in
Aegean Sea, near
Amphipolis in the
Serres regional unit. The river's length is 415 km (of which 290 km in Bulgaria, making it the country's fifth longest).