“River basin” in Japanese
Short answer
River basin in Japanese is “流域” (ryuuiki). Full meaning: drainage basin, catchment basin, river basin, watershed, valley.
Other ways to say “River basin” in Japanese
流いき
ryuuiki drainage basin, catchment basin, river basin, watershed, valley
りゅういき
ryuuiki drainage basin, catchment basin, river basin, watershed, valley
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