Boana

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Boana flows into Betsiboka , which it joins at S 17° 32′ 51″, E 47° 20′ 8″ at OSM node n1682859663, and there 7,148 km of total upstream flows in. load it's distributaries

Boana has 4 tributaries.

• (unnamed), which joins it at S 17° 34′ 36″, E 47° 18′ 12″ at OSM node n2488320384, and 24 km of total upstream flows in.
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• (unnamed), which joins it at S 17° 37′ 32″, E 47° 14′ 13″ at OSM node n2464360679, and 19 km of total upstream flows in.
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• (unnamed), which joins it at S 17° 44′ 28″, E 47° 10′ 1″ at OSM node n2466803423, and 7 km of total upstream flows in.
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• (unnamed), which joins it at S 17° 38′ 5″, E 47° 13′ 12″ at OSM node n2464360818, and 1 km of total upstream flows in.
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