Sien

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Sien flows into Boa , which it joins at N 8° 39′ 54″, W 7° 17′ 3″ at OSM node n3042546099, and there 561 km of total upstream flows in. load it's distributaries

Sien has 5 tributaries.

• Wassa, which joins it at N 9° 7′ 13″, W 7° 24′ 35″ at OSM node n2742216893, and 70 km of total upstream flows in.
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• (unnamed) , which joins it at the following points: 3 km of total upstream flows in at N 9° 18′ 37″, W 7° 32′ 4″ at OSM node n2742217070 29 km of total upstream flows in at N 9° 18′ 37″, W 7° 32′ 4″ at OSM node n2742217070
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• (unnamed), which joins it at N 8° 56′ 38″, W 7° 20′ 32″ at OSM node n2742216773, and 16 km of total upstream flows in.
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• (unnamed), which joins it at N 8° 53′ 6″, W 7° 20′ 0″ at OSM node n5467983191, and 7 km of total upstream flows in.
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• (unnamed), which joins it at N 8° 54′ 1″, W 7° 20′ 11″ at OSM node n8944213326, and 3 km of total upstream flows in.
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