(unnamed)

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(unnamed) flows into the sea: 12 km flows in at S 31° 27′ 2″, W 56° 22′ 26″ at OSM node n2613776784. (unnamed) flows into Arroyo Mataojo Grande , which it joins at S 31° 19′ 46″, W 56° 28′ 37″ at OSM node n2494169330, and there 130 km of total upstream flows in. load it's distributaries

(unnamed) has 2 tributaries.

• Arroyo Mataojo Chico, which joins it at S 31° 26′ 36″, W 56° 17′ 58″ at OSM node n1360695513, and 5 km of total upstream flows in.
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• Cañada de la Arena, which joins it at S 31° 26′ 36″, W 56° 17′ 58″ at OSM node n1360695513, and 3 km of total upstream flows in.
load it's tributaries