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Veleka is a river in the very southeast of Bulgaria, as well as the very northeast of European Turkey. It is 147 km long, of which 123 km in Bulgaria and 25 km in Turkey, and takes it sources from a number of Karst springs in the Turkish part of the Strandzha mountain to flow into the Black Sea at the Bulgarian village of Sinemorets.

The river's width near the mouth is from 8 to 10 m and its depth ranges from 2 to 4 m. At its mouth, the Veleka is 50 m wide and 7 to 8 m deep, overflowing shortly before making a turn and pouring into the sea.

The waters of the Veleka are rich in flora and fauna, with more than 30 species of freshwater fish being present, the most frequent one being the chub. Five endangered animal species inhabit the river, as well as important regional plants.