(unnamed)

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(unnamed) flows into the sea: 33 km flows in at N 19° 44′ 15″, E 105° 44′ 5″ at OSM node n12532983756. 18 km flows in at N 19° 48′ 20″, E 105° 44′ 49″ at OSM node n1684712262. (unnamed) has 3 distributaries.

• Sông Mã , which it joins at the following points: 2,570 km of total upstream flows in at N 19° 49′ 25″, E 105° 48′ 23″ at OSM node n481334390. 2,603 km of total upstream flows in at N 19° 46′ 21″, E 105° 53′ 15″ at OSM node n5933957410. load it's distributaries
• Sông Yên , which it joins at N 19° 36′ 23″, E 105° 46′ 40″ at OSM node n4711255327, and 198 km of total upstream flows in. load it's distributaries
• sông Lý , which it joins at N 19° 44′ 19″, E 105° 44′ 48″ at OSM node n4712019933, and 15 km of total upstream flows in. load it's distributaries

(unnamed) has 2 tributaries.

• Sông Chìm 12, which joins it at N 19° 50′ 30″, E 105° 46′ 10″ at OSM node n9842097847, and 3 km of total upstream flows in.
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• Sông Nông Giang, which joins it at N 19° 53′ 46″, E 105° 22′ 49″ at OSM node n9649193063, and 283 m of total upstream flows in.
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