List of dams in Japan

As a nation of islands and narrow, steep valleys, dams play a vital role in Japanese society as they are constructed primarily to control floods, supply water and generate hydroelectric power. The tallest dam in Japan is the 186 m (610 ft) high Kurobe Dam. The largest dam by structural volume in the country is the Tokuyama Dam (pictured) with 13,700,000 m³ (17,900,000 cu yd) of rock-fill. Tokuyama also creates Japan's largest reservoir with a water volume of 660,000,000 m³ (540,000 acre⋅ft).^[1]

The dams are arranged by prefecture in the list below.

Chubu region

Aichi
Fukui
Gifu
Ishikawa
Nagano
Niigata
Shizuoka
Toyama
Yamanashi

Chugoku region

Hiroshima
Okayama
Shimane
Tottori
Yamaguchi

Kansai region

Hyogo
Kyoto
Mie
Nara
Osaka
Shiga
Wakayama

Kanto region

Chiba
Gunma
Ibaraki
Kanagawa
Saitama
Tochigi
Tokyo

Kyushu region

Fukuoka
Kagoshima
Kumamoto
Miyazaki
Nagasaki
Okinawa
Oita
Saga

Hokkaido region

Hokkaido

Shikoku region

Ehime
Kagawa
Kochi
Tokushima

Tohoku region

Akita
Aomori
Fukushima
Iwate
Miyagi
Yamagata

References

^ "The Tokuyama Dam" (PDF). Japan Water Agency. Archived from the original (PDF) on 1 March 2012. Retrieved 19 January 2025.

[JWA-1] "The Tokuyama Dam" (PDF). Japan Water Agency. Archived from the original (PDF) on 1 March 2012. Retrieved 19 January 2025.

[1]

by Prefecture
Hokkaido region	Hokkaido
Tohoku region	Akita Aomori Fukushima Iwate Miyagi Yamagata
Kanto region	Chiba Gunma Ibaraki Kanagawa Saitama Tochigi Tokyo
Chubu region	Aichi Fukui Gifu Ishikawa Nagano Niigata Shizuoka Toyama Yamanashi
Kansai region	Hyogo Kyoto Mie Nara Osaka Shiga Wakayama
Chugoku region	Hiroshima Okayama Shimane Tottori Yamaguchi
Shikoku region	Ehime Kagawa Kochi Tokushima
Kyushu region	Fukuoka Kagoshima Kumamoto Miyazaki Nagasaki Okinawa Oita Saga