Devnya is a town in Varna Province, Northeastern Bulgaria, located about 25 km away to the west from the city of Varna and The Black Sea Coast. It is the administrative centre of the homonymous Devnya Municipality.
It lies at the western shore of Lake Beloslav in the northeastern end of the Devnya Valley and along the southern slopes of the Dobruja Plateau, in the close proximity to the Black Sea. Two rivers, Devnya and Provadiya, empty into the lake nearby. The landscape is mostly karst with 30 karst springs with a debit of 3700 litres per second used for water supply for Devnya, Varna and the local industries. One of the largest springs, feeding a pool, is open for visitors. Along the river mouths there are extensive wetlands once rich in fish and crabs but now polluted by industrial waste.