Ono Basin

A basin in the upper reaches of the Kuzuryu River in northeastern Fukui Prefecture. The narrow definition of the Ono Basin is usually added to the narrow definition of the Ono Basin south of Shimoarai (Katsuyama City), where the Mana River, Kiyotaki River, and Akane River join, and the somewhat wider Kuzuryu River valley (Katsuyama Basin) that continues to the north. It is thought to be a fault basin between the Ryohaku Mountains and the Echizen Chuo Mountains, but the east is widely covered with volcanic ejecta, and nothing is clear except for the Hokyoji Fault Cliff in the south. The basin is filled with sand and gravel carried by rivers, except for the Tsukahara Plateau in the southeast (the tip of the Kyogatake volcanic mudflow), and is now dry rice paddies, tobacco leaf, and taro fields, with only the Akane River basin in the west being wet rice fields. Heisenji and Ushigahara were established in ancient times, while Tsukahara and Kinomotogahara were developed after the Second World War. The western part of Ono City and Katsuyama City are the center of the north and south.

[Masahiko Shimada]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

福井県北東部、九頭竜川(くずりゅうがわ)上流にある盆地。支流の真名(まな)川、清滝川、赤根川の合流する下荒井(しもあらい)（勝山市）以南の狭義の大野盆地に、その北に続くやや幅広い九頭竜川の谷（勝山盆地）を加えるのが普通である。両白(りょうはく)山地と越前(えちぜん)中央山地の間の断層盆地と考えられるが、東は広く火山噴出物に覆われるなどして、南の宝慶寺(ほうきょうじ)断層崖(がい)のほかは明らかでない。盆地内は南東の塚原台地（経(きょう)ヶ岳火山泥流の先端）を除いて河川の運んだ砂礫(されき)で満たされ、乾田や葉タバコ、サトイモを産する畑となり、西の赤根川流域のみは湿田となっている。平泉寺(へいせんじ)、牛ヶ原(うしがはら)は古代に開かれ、塚原と木ノ本原(このもとがはら)は第二次世界大戦後開拓された。大野市西部、勝山市が南北の中心である。

［島田正彦］

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