ここから本文です。 更新日:平成24年5月25日 サイトの使い方 How to use Environmental Class Nature Class 用語集 Vocabulary Question24 Central/Shida,Haibara Many dams have been made along the Oi River that flows through the central of the prefecture. What is the dam that was constructed in 2001 as a multi-purpose dam and is popular among the people of the prefecture as the "opened dam"? Okuizumi dam Ikawa dam Nagashima dam