要害川

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要害川 flows into 七北田川 , which it joins at N 38° 18′ 48″, E 140° 53′ 49″ at OSM node n754630946, and there 150 km of total upstream flows in. load it's distributaries

要害川 has 2 tributaries.

• (unnamed), which joins it at N 38° 20′ 56″, E 140° 52′ 16″ at OSM node n754702393, and 1 km of total upstream flows in.
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• (unnamed), which joins it at N 38° 20′ 59″, E 140° 52′ 13″ at OSM node n754657583, and 433 m of total upstream flows in.
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