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The river is formed at the confluence of the Rubens and Penitentes rivers, and after traveling 180 kilometres (112 mi) it reaches the Atlantic Coast.
On its way east, after crossing a 200-kilometre (120 mi) wide glaciated canyon, it meets the tributaries Turbio, Cóndor, and Zurdo. In spite of this, the river's stream can be drastically reduced during the dry season.
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