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In page Iskar (river):

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Iskar proper is formed by the confluence of Beli and Cherni Iskar and remains a typical mountain turbulent river with very large inclination and dragging force before entering the Samokov valley at an altitude of 950 m.[2] It flows through the town of Samokov and is joined by its first significant left tributary, the Palakaria a few kilometres to the north. As it emerges out of the valley the river fills the Iskar Reservoir, the largest artificial lake in Bulgaria.[2][5] Downstream of the dam the Iskar flows in north-western direction and forms the 22 km long Pancharevo Gorge that divides the Vitosha and Plana Mountains in the west and the Sredna Gora mountain range in the east.[6] There it fills the Pasarel Reservoir and Lake Pancharevo.[7]