* Shinano River: The longest river in Japan, flowing through Nagano, Niigata, and Toyama prefectures.
* Tone River: The second-longest river in Japan, flowing through Gunma, Saitama, Ibaraki, and Chiba prefectures.
* Mogami River: The third-longest river in Japan, flowing through Yamagata and Akita prefectures.
* Kiso River: The fourth-longest river in Japan, flowing through Nagano, Gifu, Aichi, and Mie prefectures.
* Yodo River: The fifth-longest river in Japan, flowing through Kyoto, Osaka, and Hyogo prefectures.
Major lakes in Japan:
* Lake Biwa: The largest lake in Japan, located in Shiga Prefecture.
* Lake Kasumigaura: The second-largest lake in Japan, located in Ibaraki Prefecture.
* Lake Inawashiro: The third-largest lake in Japan, located in Fukushima Prefecture.
* Lake Towada: The fourth-largest lake in Japan, located in Aomori and Akita prefectures.
* Lake Kussharo: The fifth-largest lake in Japan, located in Hokkaido Prefecture.
Major straits in Japan:
* Tsugaru Strait: The strait between Honshu and Hokkaido.
* Kanmon Strait: The strait between Honshu and Kyushu.
* Akashi Strait: The strait between Honshu and Shikoku.
* Kurushima Strait: The strait between Honshu and Shikoku.
* Bungo Strait: The strait between Kyushu and Shikoku.
