The Dvoynitsa (Bulgarian: Двойница) is a 52 km long river in eastern Bulgaria that flows into the Black Sea. The river takes its source under the name...

Luda Kamchiya (R) Kotlenska reka (L) Medvenska reka (L) Eleshnitsa (R) Dvoynitsa (Ms) Hadzhiyska reka (Ms) Aheloy (Ms) Aytoska reka (Ms) Chukarska reka...

Island St. Ivan Island St. Peter Island St. Thomas Island Aheloy Batova Dvoynitsa Fakiyska Hadzhiyska Kamchiya Provadiya Rezovska Ropotamo Shkorpilovska...

Bulgarian Black Sea Coast, including the rivers Provadiya, Kamchiya, Dvoynitsa, Hadzhiyska reka, Aheloy, Aytoska reka, Chukarska reka, Rusokastrenska...

of the Eminska Planina, which separates it from the basin of the river Dvoynitsa. To the south the ridge of the Aytoska Planina forms the boundary with...