Treklyanska reka

The Treklyanska reka is a river in western Bulgaria, a right tributary of the Struma. The river is situated in the Kraishte geographical region and is 50 km long. It drains the eastern slopes of the mountain ranges of Karvav Kamak, Milevska Planina and Kobilska Planina, the northern and eastern slopes of the Zemenska Planina, the western and southern slopes of the Penkyovska Planina and the western slopes of the Rudina Planina.

The river takes its source under the name Melanshtitsa in Bohovska Planina at an altitude of 1,318 m, at 300 m southwest of the summit of Ogorelitsa (1,318 m) on the Bulgaria–Serbia border. Except for two stretches near the villages of Treklyano and Peshtera, it flows in a deep narrow valley. Until the village of Gabreshevtsi it flows southwards between the mountain ranges of Karvav Kamak, Milevska Planina and Kobilska Planina to the west and Penkyovska Planina and Elovishka Planina to the east. Downstream of Gabreshevtsi the river turns east and under the name Rayanska reka passes through the 8.5 m Rayanski Gorge between Penkyovska Planina to the north and Zemenska Planina to the south. After receiving its largest tributary the Yavor, the river turns in direction south–southeast and after 6 km flows into the Struma at an altitude of 595 m in the northern areas of the town of Zemen.