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

This page outlines Japan's river management classification system administered by the Ministry of Land, Infrastructure, Transport and Tourism. Rivers are categorized into four types: Class-1 rivers managed by the national government or prefectures, Class-2 rivers managed by prefectures, quasi-public rivers managed by municipalities, and ordinary rivers managed by municipalities. The page provides detailed information about Class-1 rivers under national management, including water system names, river names, managed sections, and contact information for relevant river management offices throughout Japan.