Kejyonuma Dam

Kejyonuma Dam (Japanese: 化女沼ダム) is an earthen dam in the city of Ōsaki, Miyagi Prefecture, Japan, completed in 1995.[2] The dam crosses the Tajiri River, a branch of the Kitakami River and utilises the basin of a pre-existing natural lake.

Kejyonuma Dam
Kejonuma Dam spillway.jpg
Kejyonuma Dam is located in Miyagi Prefecture
Kejyonuma Dam
Location of Kejyonuma Dam in Miyagi Prefecture
Kejyonuma Dam is located in Japan
Kejyonuma Dam
Kejyonuma Dam (Japan)
LocationŌsaki, Miyagi, Japan
Coordinates38°37′36″N 140°57′50″E / 38.62667°N 140.96389°E / 38.62667; 140.96389Coordinates: 38°37′36″N 140°57′50″E / 38.62667°N 140.96389°E / 38.62667; 140.96389
Construction began1980
Opening date1995
Owner(s)Miyagi Prefecture
Dam and spillways
Type of damEarthen dam
Height24 meters
Length260 meters
CreatesLake Kejyonuma
Total capacity2,880,000 sq m
Catchment area9.93 sq km
Surface area65 hectares
Official nameKejo-numa
Designated31 October 2008
Reference no.1843[1]

A 34 hectare portion of the wetlands at Lake Kejyonuma has been protected since October 2008 as a Ramsar site in Japan.[3]


  1. ^ "Kejo-numa". Ramsar Sites Information Service. Retrieved 25 April 2018.
  2. ^ "Kejonuma Dam [Miyagi Pref.] - Dams in Japan".
  3. ^ [1] Kejo-numa Water Storage Area, Permanent Freshwater Lake