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流域

ひらがな

りゅういき

noun

river basin

Many types of fish inhabit this river basin.

noun

sewer installed by 都道府県 (todōfuken, “a prefecture”) in order to treat sewage from two or more 市町村 (shichōson, “cities, towns, and villages”)

This area is equipped with a sewer installed by the prefecture, making life very convenient.

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