イオナイ川

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イオナイ川 flows into 天塩川 , which it joins at N 44° 27′ 14″, E 142° 20′ 51″ at OSM node n1459054834, and there 2,976 km of total upstream flows in. load it's distributaries

イオナイ川 has 2 tributaries.

• 十八線川, which joins it at N 44° 26′ 47″, E 142° 21′ 27″ at OSM node n1459052804, and 3 km of total upstream flows in.
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• (unnamed), which joins it at N 44° 26′ 21″, E 142° 21′ 17″ at OSM node n1459051509, and 2 km of total upstream flows in.
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