Yonago Plain - Yonagohei

A plain in the lower reaches of the Hino River in western Tottori Prefecture. It is an alluvial fan plain with the alluvial fan at the western foot of Mt. Daisen and the area around Hoki Town as its apex, and in a broader sense includes the Yumigahama (Yomigahama) sandbar. Along the coast of Miho Bay, wide sandbanks have been formed due to sea level changes and sand flow from the iron hole drift in the upper reaches of the Hino River. The geology consists of granite gravel from the Hino Mountains and volcanic clastic gravel from Mt. Daisen, with marine deposits containing shell fossils at depths of 4 meters or more and diluvial deposits at depths of 25 meters or more. In addition to lowland remains from the end of the Early Jomon period, the remains of a jori structure can be seen west of Kuzumo, Yonago City, and Sada, Yodoe Town, Yonago City, and traces of a river channel that moved three times west remain. Irrigation from the Sano River and other irrigation waters has been carried out since the Edo period, and the area has become a grain-producing region. In addition to rice cultivation, tobacco leaves, white leeks, and carrots are cultivated in the sand dune areas.

[Minoru Iwanaga]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

鳥取県西部、日野(ひの)川下流域の平野。大山西麓(だいせんせいろく)の扇状地や伯耆(ほうき)町付近を扇頂とする扇状地性平野で、広義には弓ヶ浜（夜見(よみ)ヶ浜）砂州(さす)を含む。美保(みほ)湾沿岸には海面変動や、日野川上流での鉄穴(かんな)流しの流砂によって広い砂堆(さたい)の形成がみられる。地質は日野山地の花崗岩砂礫(かこうがんされき)や大山の火山砕屑(さいせつ)岩砂礫などからなり、4メートル以深には貝化石を含む海成層、25メートル以深には洪積層がある。縄文早期末以後の低地遺跡のほか米子市東尾(くずも)―米子市淀江町佐陀(よどえちょうさだ)以西には条里遺構がみられ、西に三遷した河道跡を残す。江戸時代から佐野川などの用水による灌漑(かんがい)が行われ、穀倉地帯となってきた。米作のほか、砂堆地域では葉タバコ、白ネギ、ニンジン栽培が行われる。

［岩永　實］

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