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within the territory of Bulgaria. The Danube and the Maritsa rivers are both longer but they also flow through other countries. The Iskar is a tributary to the Danube and forms part of the Black Sea river basin. It is the only river that takes its source in southern Bulgaria and flows north through the Balkan Mountains that form the water divide between the basins of the Black Sea to the north and the Aegean Sea to the south. In terms of geology,

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