(unnamed)

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(unnamed) flows into the sea: 5 km flows in at S 17° 44′ 0″, W 64° 48′ 33″ at OSM node n11351219128. 822 m flows in at S 17° 45′ 48″, W 64° 43′ 26″ at OSM node n10603854862. (unnamed) flows into Río San Mateo , which it joins at S 17° 38′ 16″, W 64° 36′ 6″ at OSM node n5584260845, and there 164 km of total upstream flows in. load it's distributaries

(unnamed) has 4 tributaries.

• Río San Miguel , which joins it at the following points: 26 km of total upstream flows in at S 17° 43′ 3″, W 64° 41′ 2″ at OSM node n2565288166 25 km of total upstream flows in at S 17° 43′ 8″, W 64° 41′ 10″ at OSM node n5584259967
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• Río Chontal, which joins it at S 17° 42′ 33″, W 64° 38′ 27″ at OSM node n5585000881, and 20 km of total upstream flows in.
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• Río Cristal, which joins it at S 17° 40′ 38″, W 64° 38′ 26″ at OSM node n5584260634, and 9 km of total upstream flows in.
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• Río Los Diablos, which joins it at S 17° 39′ 49″, W 64° 37′ 2″ at OSM node n5584260773, and 5 km of total upstream flows in.
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