its western side onto Mano Bay (真野湾), where the longest river, Kokufugawa (国府川, also read Konogawa) reaches the sea. The island has a symmetrical shape...

[permanent dead link] 大地山 (in Japanese). 山と溪谷社. Retrieved 9 July 2017. 国府川水系河川整備計画 (PDF) (in Japanese). 新潟県. Retrieved 9 July 2017. [permanent dead...