古川

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古川 flows into 田名部川 , which it joins at N 41° 18′ 59″, E 141° 15′ 55″ at OSM node n753156534, and there 26 km of total upstream flows in. load it's distributaries

古川 has 1 tributaries.

• (unnamed), which joins it at N 41° 19′ 35″, E 141° 15′ 35″ at OSM node n753472770, and 15 km of total upstream flows in.
load it's tributaries