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Located at the south-west of the department, the so-called Cordillera del Sira has a rough topography. This cordillera separates the Ucayali river from the Pachitea and the Pichis. To the east of the Cordillera Azul there are the plains from which emerge isolated hills. Close to the border with Brasil is to be found Contamana, with hills of low altitude, with heights of up to 788 meters. On the banks of the Ucayali river are to be seen non-flood terraces. Sometimes these are very much eroded and become marshes named "tahuampas" or "aguajales". From the point of view of water distribution the Ucayali rivers gathers the superficial waters that drain its territory. The department has two well defined areas: the Alto Ucayali and the Bajo Ucayali. The course of the Ucayali river can be entirely navigated. The main port is Pucallpa, to which ships with a draught of up to 8 feet can arrive. The main affluents of the Ucayali river are: the Cohenga, Tahuania, Sheshea, Pachitea and Aguaytía. There are numerous lagoons suh as Yarinacocha, Unira and Chioa.
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