Kejyonuma Dam is an earthen dam in the city of Ōsaki, Miyagi Prefecture, Japan, completed in 1995. The dam crosses the Tajiri River, a branch of the Kitakami River and utilises the basin of a pre-existing natural lake.
A 34 hectare portion of the wetlands at Lake Kejyonuma has been protected since October 2008 as a Ramsar site in Japan.
Wikipedia https://en.wikipedia.org/wiki/Kejyonuma_Dam
Address Japan
Coordinates 38°37'37.271" N 140°57'51.015" E