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| 流域面積 (ryūiki-menseki) River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 河う River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 河川の流域 River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
| 流域 (りゅういき) | |||
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river : 2 phrases in 1 subject |
| General | 2 |
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