(unnamed)

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(unnamed) flows into the sea: 5 km flows in at N 20° 50′ 0″, E 106° 20′ 21″ at OSM node n4775091843. 945 m flows in at N 20° 54′ 48″, E 106° 20′ 3″ at OSM node n2908425466. (unnamed) has 2 distributaries.

• Sông Thái Bình , which it joins at N 20° 53′ 36″, E 106° 22′ 2″ at OSM node n4775095400, and 1,317 km of total upstream flows in. load it's distributaries
• Sông Tứ Kỳ , which it joins at N 20° 49′ 24″, E 106° 22′ 12″ at OSM node n4775091833, and 18 km of total upstream flows in. load it's distributaries

(unnamed) has 0 tributaries.