Class A river

A Class A river (一級水系, Ikkyū suikei) is a river classification in Japan designated by the River Law (河川法, Kasen Hō).[1][2] It is applied to rivers and waterways deemed to be important to the economy of the nation as a whole, as well as those deemed important to the conservation of nature within Japan. There are currently 109 rivers with this designation.[3]

It is administered by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT).

Class B river

The smaller, but important rivers are designated as Class B rivers (Japanese language: 二級水系), nominated and managed by the local governments at the prefecture level, but reported to and concurred by the central government.

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References
  1. "River Administration in Japan". Ministry of Land, Infrastructure, Transport and Tourism. Retrieved December 31, 2017.
  2. "河川法" [River Law] (in Japanese). Ministry of Land, Infrastructure, Transport and Tourism. Archived from the original on July 6, 2016. Retrieved July 6, 2016.
  3. "河川法第四条第一項の水系を指定する政令" [River Law Clause 4 Paragraph 1: River System Designation Ordinance] (in Japanese). e-Gov.go.jp. Archived from the original on July 6, 2016. Retrieved July 6, 2016.
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