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Koyoshi River

Coordinates: 39°23′26″N 140°00′51″E / 39.3906°N 140.0141°E

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Koyoshi River 子吉川
Koyoshi River in 2021

Location
Country	Japan
State	Honshu
Region	Akita
Physical characteristics

Source	Mount Chōkai^[1]^[2]
• elevation	2,236^[3] m (7,336 ft)

Mouth	Sea of Japan
• coordinates	39°23′26″N 140°00′51″E / 39.3906°N 140.0141°E / 39.3906; 140.0141
Length	61 km (38 mi)^[1]^[2]
Basin size	1,190 km² (460 sq mi)^[1]^[2]

Koyoshi River (Japanese: 子吉川（こよしがわ）, Hepburn: koyoshigawa) is a river in Akita Prefecture, Japan. It originates from Mount Chōkai, where the border of Akita Prefecture and Yamagata Prefecture is located, and flows through Yurihonjō and finally into Sea of Japan. The headstream of the river is called Chōkai River (鳥海川, chōkaigawa).^[1]^[2] It has the third largest drainage area of the class A rivers that flow through Akita Prefecture, after Omono River and Yoneshiro River.^[4]

References

^ ^a ^b ^c ^d "日本の川 - 東北 - 子吉川 - 国土交通省水管理・国土保全局" (in Japanese). Ministry of Land, Infrastructure, Transport and Tourism, Japan. Retrieved December 28, 2017.
^ ^a ^b ^c ^d "子吉川(こよしがわ)とは - コトバンク" (in Japanese). kotobank. Retrieved December 28, 2017.
^ "気象庁鳥海山" (in Japanese). Japan Meteorological Agency. Retrieved December 28, 2017.
^ "一級河川水系別延長等" (in Japanese). Ministry of Land, Infrastructure, Transport and Tourism, Japan. Retrieved December 28, 2017.

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River systems and rivers of Japan

Rivers of Hokkaido

Sea of Japan	Ishikari River Chitose River Toyohira River Makomanai River Anano River Yūbari River Koetoi River Rumoi River Shiribeshi-Toshibetsu River Shiribetsu River Teshio River Zenibako River
Sea of Okhotsk	Abashiri River Shibetsu River Shokotsu River Tokoro River Yūbetsu River
Pacific Ocean	Akan River Kushiro River Mitsuishi River Mu River Niikappu River Saru River Shizunai River Tokachi River
Rivers of Hokkaido on Commons

Rivers of Honshu

Tōhoku region	Abukuma River Arakawa River Iwaki River Kitakami River Komagome River Koyoshi River Mabechi River Mogami River Natori River Ōhata River Oirase River Omono River Takase River Yoneshiro River
Kantō region	Arakawa River Edo River Fuji River Kanda River Kuji River Naka River Sagami River Sumida River Tama River Tone River Tsurumi River
Chūbu region	Agano River Shinano River Seki River Hime River Kurobe River Jōganji River Jinzū River Shō River Oyabe River Tedori River Kuzuryū River Fuji River Abe River Ōi River Sakawa River Tenryū River Toyo River Yahagi River Shōnai River Kiso Three Rivers Kiso River Nagara River Ibi River Kushida River Miya River Kita River Minami River
Kansai region	Choshi River Ibo River Kako River Kinokawa River Kumano River Kuzuryu River Maruyama River Muko River Yamato River Yodo River Yasu River Katsura River Kamo River Kizu River Dōton River Yura River
Chūgoku region	Asahi River Ashida River Gōnokawa River Hino River Hii River Ōta River Oze River Saba River Sendai River Takahashi River Takatsu River Tenjin River Yoshii River

Rivers of Shikoku

Rivers of Kyushu

Kyushu	Arie River Chikugo River Kikuchi River Kuma River Mimi River Ōno River Ōyodo River
Yaeyama Islands	Kokuba River Nakama River Urauchi River

Rivers of Japan Category
Rivers of Japan on Commons

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