Ishiwaki

…Southwestern Akita Prefecture, a plain downstream of the Koyoshi River. The lagoon inside the coastal sand dunes between Ishiwaki and Nishime was filled and formed by sediment carried by the Koyoshi River and its tributaries, the Ayu River, the Ishizawa River, and the Imo River. The area is mainly made up of a delta lowland to the west and an alluvial fan lowland, and includes coastal sand dunes and some plateaus. …

*Some of the terminology that mentions "Ishiwaki" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…秋田県南西部，子吉川下流の平野。石脇～西目間の海岸砂丘内側の潟湖が，子吉川や支流の鮎川，石沢川，芋川などの運んだ土砂などによって埋積･形成された。西寄りの三角州低地と，それに続く扇状地性低地を主とし，海岸砂丘と若干の台地を含む。…

※「石脇」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報