The highest section of the cascade includes three gathering derivations covering a total area of 219 km that catch waters from the drainage basins of the Maritsa (45%), the Mesta (32%) and the Struma (23%). These are the Granchar derivation that gathers water from the upper courses of Mesta's right tributaries — the Cherna Mesta, the Bela Mesta and the Belishka reka, as well as from le.
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