一級河川 (いっきゅうかせん) — class A river; specified waterways of special importance protected by the government
一級河川
い っ きゅ う か せ ん
Class A river; specified waterways of special importance protected by the government
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一級河川 (いっきゅうかせん) — class A river; specified waterways of special importance protected by the government
