古川

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古川 flows into 静内川 , which it joins at N 42° 19′ 47″, E 142° 22′ 3″ at OSM node n1466155375, and there 510 km of total upstream flows in. load it's distributaries

古川 has 2 tributaries.

• 旧古川, which joins it at N 42° 20′ 35″, E 142° 22′ 19″ at OSM node n1466161011, and 3 km of total upstream flows in.
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• 旧シンヌツ川, which joins it at N 42° 20′ 8″, E 142° 21′ 47″ at OSM node n5515407255, and 2 km of total upstream flows in.
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