古川

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古川 flows into (unnamed) , which it joins at N 34° 51′ 8″, E 135° 46′ 1″ at OSM node n2686785449, and there 12 km of total upstream flows in. load it's distributaries

古川 has 2 tributaries.

• (unnamed), which joins it at N 34° 51′ 6″, E 135° 46′ 18″ at OSM node n969518105, and 6 km of total upstream flows in.
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• 今池川, which joins it at N 34° 51′ 8″, E 135° 46′ 1″ at OSM node n969524814, and 5 km of total upstream flows in.
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