(unnamed)

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(unnamed) flows into the sea: 434 km flows in at N 28° 5′ 1″, W 96° 57′ 18″ at OSM node n11933091966. 168 m flows in at N 28° 0′ 59″, W 97° 12′ 39″ at OSM node n5062858695.

(unnamed) has 3 tributaries.

• Mission River, which joins it at N 28° 9′ 51″, W 97° 10′ 19″ at OSM node n263160879, and 192 km of total upstream flows in.
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• Aransas River, which joins it at N 28° 3′ 44″, W 97° 14′ 29″ at OSM node n11933121547, and 157 km of total upstream flows in.
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• Copano Creek, which joins it at N 28° 12′ 4″, W 97° 2′ 14″ at OSM node n1849640931, and 16 km of total upstream flows in.
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