www.mlit.go.jp/river/riyou/kubun/index.html

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主な施策：利用 - 河川の管理区分について - 国土交通省水管理・国土保全局

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https://www.mlit.go.jp/river/riyou/kubun/index.html

About this page

This page explains Japan's river management classification system. Rivers are categorized into four types: Class I rivers, Class II rivers, Quasi-designated rivers, and Ordinary rivers. Class I rivers are managed by the Ministry of Land, Infrastructure, Transport and Tourism or prefectures (some by ordinance-designated cities); Class II rivers by prefectures; and both Quasi-designated and Ordinary rivers are managed by municipalities. The page provides detailed information about Class I rivers managed by the national government, including specific water system names, river names, managed sections, and contact information for regional offices.