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流域 りゅういき
gen. Basin Geological Terms Dictionary (Bruce Bain and Leslie Oberman) ; valley Geological Terms Dictionary (Bruce Bain and Leslie Oberman) ; catchment area (of an aquifer) River and Water Resources Glossary (Infrastructure Development Institute Japan)
construct. river basin
tech. drainage basin
流域 news1 nf10 | news1 nf10 りゅういき
gen. river basin n