Boyalashka reka
General data
- Name: Boyalashka reka
- Water system: Maritsa (Evros)
- Water type: River
- Progression: Arapliyska reka -> Popovska reka -> Tundzha -> Maritsa (Evros) -> Aegean Sea -> Mediterranean Sea -> Atlantic Ocean -> Planet Earth
- Climates: Temperate
- Continents: Europe
- Countries: Bulgaria
The Boyalashka reka is a 33 km long river in southern Bulgaria, a right tributary of the river Arapliyska reka, itself a left tributary of the Popovska reka of the Tundzha basin. It is the largest tributary of the Arapliyska reka.
The river takes its source under the name Chakarlia an altitude of 502 m in the Dervent Heights, some 7005 m south of their highest point Gyurgenbair, which is situated in Bulgarian territory just north of the Bulgaria–Turkey border. It flows in a narrow forested valley through the northern slopes of the Dervent Heights in direction northwest. It flows into the Arapliyska at an altitude of 117 m east of the village of Chernozem.
Its drainage basin covers a territory of 159 km2.
