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 present, the most frequent one being the chub. Five endangered animal species inhabit the river, as well as important regional plants.
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