(unnamed)

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(unnamed) flows into the sea: 117 km flows in at N 14° 0′ 10″, W 91° 26′ 8″ at OSM node n3344653994. 15 km flows in at N 14° 10′ 32″, W 91° 22′ 24″ at OSM node n4443655191. 8 km flows in at N 14° 10′ 19″, W 91° 22′ 34″ at OSM node n4443655061.

(unnamed) has 2 tributaries.

• Río Madre Vieja, which joins it at N 14° 19′ 25″, W 91° 15′ 36″ at OSM node n3344668414, and 96 km of total upstream flows in.
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• Río Chipó, which joins it at N 14° 19′ 25″, W 91° 15′ 36″ at OSM node n3344668414, and 2 km of total upstream flows in.
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