古川

古川 is 11 km long, and has a stream level of 1.

Map of 古川

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It has 2 side channels.

古川 flows into 本津川 , which it joins at N 34° 18′ 51″, E 133° 59′ 28″ at OSM node n756068102, and there 52 km of total upstream flows in.

古川 has 3 tributaries.

(unnamed), which joins it at N 34° 17′ 35″, E 133° 59′ 48″ at OSM node n756098636, and 1 km of total upstream flows in.

(unnamed), which joins it at N 34° 13′ 58″, E 134° 1′ 12″ at OSM node n1039379952, and 844 m of total upstream flows in.

(unnamed), which joins it at N 34° 15′ 21″, E 134° 0′ 28″ at OSM node n12357788501, and 83 m of total upstream flows in.