The Devnya (Bulgarian: Девня) is a 27 km long river in northeastern Bulgaria, a left tributary of the Provadiya, which flows into Lake Beloslav draining into the Black Sea.

[1] The river takes its source from several karst springs, situated north and northeast of the town of Suvorovo.

Its main stem is the Mezenska Cheshma spring at an altitude of 314 m some 2 km north of the town.

Due to the capture of many of the springs and the water utilization for the nearby industrial complex and the city of Varna, the flow has dropped to 0.5 m3/s.

[1] The Reka Devnia Hoard discovered in 1929 near the river close to the ruins of the ancient city of Marcianopolis, is the largest treasure of Roman silver coins ever found, consisting of about 100,000 coins with a weight of 350 kg.