The River Mert (Turkish: Mert Irmağı); anciently, the Lycastus (Ancient Greek: Λύκαστος, romanized: Lykastos)[1] is a river in Turkey which flows into the Black Sea at Samsun.

[2] The ancient town of Lycastus in Pontus was located on the river; the site has not been located.

[1] A local politician claims the river suffers from domestic and industrial pollution, and fish die off in 2014 is being investigated by local officials.

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