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Tone River

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description Tone River Overview

The Tone River is a river on Honshu, Japan, with a course of about 322 kilometers through the Kanto region. It rises in the mountains, crosses the Kanto Plain, and reaches the Pacific Ocean near Choshi. Its basin is closely connected with flood control, water supply, agriculture, and transport for the densely settled plain around Tokyo and neighboring prefectures.

help Tone River FAQ

Where does the Tone River begin and where does it reach the Pacific?

It rises in the mountains of Gunma Prefecture, crosses the Kanto Plain, and reaches the Pacific near Choshi in Chiba. That route makes it a major drainage artery for eastern Honshu. [Japan Tourism Agency](https://www.mlit.go.jp/tagengo-db/en/R2-00738.html)

Why is the Tone River important to the Kanto region?

Its basin supports flood control, municipal water supply, irrigation, and agriculture across the Kanto Plain. The Tone is therefore both a geographic feature and a major water-management system. [MLIT](https://www.ktr.mlit.go.jp/tonejo/tonejo00182.html)

How long is the Tone River?

The Tone River is about 322 kilometers long, making it one of Japan's major rivers. Its drainage basin is around 16,840 square kilometers, among the largest river basins in Japan.

Does the Tone River flow through the Kanto Plain?

Yes, the river descends from the mountains and crosses the broad Kanto Plain before reaching the Pacific. That lowland course is why the river is closely associated with farming, urban water supply, and flood control.

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