List of rivers flowing through Yokohama City

Yokohama City has 9 first-class rivers, 24 second-class rivers, and 23 mutatis mutandis rivers, totaling 56 rivers. The total length will be about 215 km.

"First-class rivers" are rivers that are particularly important on the national land conservation or on the national economy, and are designated by the Minister of Land, Infrastructure, Transport and Tourism.
A "second-class river" means a river other than a first-class river that is important to public interest, and refers to a river designated by the prefectural governor.
"Mutualized rivers" means rivers designated by the mayor as important from the viewpoint of public nature, other than first-class rivers and second-class rivers.
Other than these three types are called "ordinary rivers", "general sewers" or "waterways".

The river becomes a large river as small rivers merge from the upstream, and gradually head toward the sea while repeating this junction. The unit of these groups of rivers is called a "water system."

The rivers that flow through Yokohama can be divided into the Tsurumi River, the Katabira River, the Okagawa River, the Sakaigawa River, and other rivers.
Click on the river name to see the river's management classification and extension.
※The same river may be divided into first-class rivers and mutatis mutandis rivers, and second-class rivers and mutatis mutandis rivers.

(1)Tsurumi River Water System
・First-class rivers: Tsurumi River, Onda River, Umeda River, Kamoi River, Okumakawa River, Toriyama River, Sunada River, Hayabuchi River, Yagami River
・Mutatis mutandis rivers: Kurosuda River, Nara River, Iwakawa, Hayabuchi River, Fukawa

(2)Katabira River Water System
・Second-class rivers: Katabira River, Naka-Horikawa, Ima Igawa, Ishizaki River, Aratama River, Saiwai River, Katabira River Channel
・Mutatis mutandis rivers: Shin-Igawa, Kunugidai River, Yasashi River

(3)Ookagawa Water System
・Second-class rivers: Ookagawa, Hino River, Naka-Murakawa, Horikawa, digging river, Okagawa diversion channel
・Mutatis mutandis rivers: Ookagawa, Hino River

(4)Sakaigawa Water System
・Second-class rivers: Sakaigawa, Kashio River, Akuwa River, Itachi River, Izumi River, Maioka River, Nasegawa River, Hirato Nagatani River, Udagawa
・Mutatis mutandis rivers: Kawakami River, Aizawa River, Seriya River, Maioka River

(5)Other water systems
・Second-class rivers: Samuraigawa, Miyakawa
・Mutatis mutandis rivers: Irie River, Irie River First School River, Irie River Second River, Irie River First Elementary School River, the Irie River Second Elementary School River, the Irie River No.

For river management, the river law stipulates the national, prefectural, and city management divisions for each river and its designated section.

The government manages the section of the Minister of Land, Infrastructure, Transport and Tourism of first-class rivers.

Kanagawa Prefecture manages the prefectural governor-designated section of first-class rivers, prefectural governor-managed sections of second-class rivers, and prefectural governor-managed mayor construction and maintenance sections.

Yokohama City manages the mayor-managed section of first-class rivers, mayor-managed sections of second-class rivers, and mutatis mutandis rivers.

The following table shows the extension of management for each river.

For example, if it is the Tsurumi River, which is the number 1 of a first-class river.
The country manages 17,400m.
Kanagawa Prefecture manages 13,100 m.
Indicates that there is no management section of the mayor.

In addition, some rivers can fly to the river introduction page by clicking the river name.

There is also a video and pamphlet explaining the river flowing through Yokohama City.
For more information, please check the "Yokohama River" PR video.
For more information, please refer to the "Yokohama River" brochure.