古川

古川 is 10 km long, and has a stream level of 1.

Map of 古川

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It has 1 side channels.

古川 flows into 日高川 , which it joins at N 33° 59′ 37″, E 135° 33′ 42″ at OSM node n975238469, and there 60 km of total upstream flows in.

古川 has 5 tributaries.

蟻合谷, which joins it at N 34° 1′ 40″, E 135° 34′ 31″ at OSM node n974647341, and 2 km of total upstream flows in.

(unnamed), which joins it at N 34° 2′ 34″, E 135° 34′ 31″ at OSM node n974465996, and 2 km of total upstream flows in.

赤木谷, which joins it at N 34° 1′ 15″, E 135° 34′ 38″ at OSM node n974980119, and 1 km of total upstream flows in.

利谷, which joins it at N 34° 2′ 4″, E 135° 34′ 32″ at OSM node n974705359, and 1 km of total upstream flows in.

(unnamed), which joins it at N 34° 2′ 47″, E 135° 34′ 34″ at OSM node n974606727, and 339 m of total upstream flows in.