Bosna (ridge) in the context of "Fakiyska reka"

The Ropotamo (Bulgarian: Ропотамо [ropoˈtamo], from the Ancient Greek word Ροπόταμος ropotamos meaning "border river") is a river in south-eastern Bulgaria. It takes its source from the Bosna Ridge in the Strandzha Mountains, running for 48.5 km to empty into the Black Sea near Cape Saint Demetrius between Dyuni and Primorsko.

The river is most often noted for its 30 m-wide mouth that is home to an abundance of flora species, over 100 of which endangered in the country. The lower section of the river is a protected area since 1940 and forms part of the Ropotamo Reserve. The lower Ropotamo is a popular tourist attraction because of the water lilies and the rock formations above the river, on some of which white-tailed eagles nest.

The Dyavolska reka (Bulgarian: Дяволска река, "devil's river") is a 37 km long river in Burgas Province, southeastern Bulgaria.

The river originates under the name Dudenska reka from a spring at an altitude of 440 m, southeast of the summit of Chukara (466 m) in the Bosna Ridge of the Strandzha mountain range. It flows in northeastern direction though a forested valley until the village of Yasna polyana. Downstream of the village it turns east and forms a wide swampy valley until its mouth in a dike-protected riverbed. It flows into the Black Sea at the town of Primorsko. The marshy area at is mouth is known as Dyavolsko blato (Bulgarian: Дяволско блато, "devil's swamp"), covered by common reed ("Phragmites australis"). The swamp is fed by a freshwater spring, has an area of 2.7 km and depth up to 3 m.

The Izvorska reka (Bulgarian: Изворска река) is a 35 km long river in eastern Bulgaria that flows into Lake Burgas, which drains into the Black Sea.

The river takes its source under the name Selska reka at an altitude of 386 m in the Bosna Ridge in the northern part of the Strandzha mountain range, some 3.5 km southwest of the village of Indzhe Voivoda. It flows in direction north-northeast in a deep valley, which unlike most others in Strantdzha is not densely forested. Near the village of Krushevets its valley widens and then narrows and deepens again until finally widening downstream from the village of Izvor. The Izvorska reka flows into Lake Mandrensko some 1.8 km southwest of the village of Tvarditsa. The lake itself drains into the Gulf of Burgas in the Black Sea.