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Ashida River

River in Japan

Ashida River



Native name	芦田川 (Japanese)
Location
Country	Japan
Physical characteristics

Source
• location	Daiwa-chō, Mihara on the Sera Plateau in Hiroshima Prefecture
• elevation	570 m (1,870 ft)

Mouth
• location	Seto Inland Sea
• coordinates	34°26′16″N 133°24′21″E / 34.4378°N 133.4058°E / 34.4378; 133.4058
• elevation	0 m (0 ft)
Length	86 km (53 mi)
Basin size	870 km² (340 mi²)

The Ashida River (芦田川, Ashida-gawa) is a river that flows through the eastern part of Hiroshima Prefecture, Japan. The river provides the primary drainage for the Bingo region.

The source of the river is in the city of Mihara, Hiroshima and flows generally east toward Niimi, Okayama. After flowing through the Hattabara and Mikawa Dams in Fuchū, Hiroshima, the river passes through Fukuyama, Hiroshima, where it empties into the Seto Inland Sea.

Geography and development

The Ashida River originates in Daiwa-chō, Mihara on the Sera Plateau in Hiroshima Prefecture in Japan.^[1] It travels for 86 kilometres (53 mi) mostly eastward through eastern Hiroshima Prefecture, and has a drainage basin of 870 square kilometres (340 mi²).^[1] This river is the primary drainage for the Bingo region.^[2]

Flood retaining walls were constructed along the banks of the Ashida River in 1928.^[3] It was designated as a Class A river in 1967.^[4]

In a report from 2015, the river was ranked the worst for water quality among the thirteen Class A rivers in the Chugoku region.^[5] Since 2012, the water quality in the Ashida River has improved significantly, with tributaries showing improvements between 17 and 43 percent.^[6]

Flora and fauna

In the 2020s, Okayama University conducted a study of the river to survey the population of Rhodeus suigensis in the river basin. The Japanese Ministry of the Environment had designated the species as extremely endangered. Environmental DNA analysis was utilized by the university to determine the concentration of the bitterling fish in various portions of the river.^[7]

References

1 2 Overview of the Ashida River basin and rivers, p.1.
↑ Overview of the Ashida River basin and rivers, p.20.
↑ Bill, Richard (15 September 1981). "Japanese Archaeologists Uncover Once Flourishing Medieval Port". Schenectady Gazette. p. 4. Retrieved 1 February 2024.
↑ Overview of the Ashida River basin and rivers, p.52.
↑ 芦田川水質4年連続ワースト [Ashida River water quality worst for four consecutive years] (in Japanese). Chugoku Shimbun. 20 July 2016. Retrieved 19 August 2016.{{cite web}}: CS1 maint: deprecated archival service (link)
↑ "Current status of water quality of Class A rivers in the Chugoku region", p.6.
↑ Sexton, Chrissy (7 February 2023). "Environmental DNA can help track endangered species". Earth.com. Archived from the original on 9 February 2023. Retrieved 1 February 2024.

Works cited

芦田川水系流域及び河川の概要 [Overview of the Ashida River basin and rivers] (PDF) (in Japanese). Ministry of Land, Infrastructure, Transport and Tourism. Archived (PDF) from the original on 1 February 2024. Retrieved 1 February 2024.
中国地方一級河川の水質現況 [Current status of water quality of Class A rivers in the Chugoku region] (PDF) (in Japanese). Chugoku Regional Development Bureau / MLIT. 2022. Archived (PDF) from the original on 2 February 2024. Retrieved 2 February 2024.

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

Aibiki River
Shimanto River
Shinmachi River
- Suketō River
Yoshino River
- Dōzan River
Niyodo River

Rivers of Kyushu

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

Rivers of Japan Category
Rivers of Japan on Commons

Authority control databases
International	VIAF
National	Japan

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