Oyama Kami-ike and Shimo-ike

Oyama Kami-ike and Shimo-ike in Feburary
Whooper Swans, Tundra Swans and Mallards in Oyama Kami-ike and Shimo-ike
Northern Printails in Oyama Kami-ike and Shimo-ike

Oyama Kami-ike and Shimo-ike

  • Country: 
  • Site number: 
  • Area: 
    39 ha
  • Designation date: 
  • Coordinates: 
    38°45'N 139°45'E
Materials presented on this website, particularly maps and territorial information, are as-is and as-available based on available data and do not imply the expression of any opinion whatsoever on the part of the Secretariat of the Ramsar Convention concerning the legal status of any country, territory, city or area, or of its authorities, or concerning the delimitation of its frontiers or boundaries.


Located near Mount Takadate, the Site comprises two near-natural ponds which were built for irrigation about 400 years ago. The Site is globally important for the endangered Japanese eel (Anguilla japonica) and Shinai top-mouth gudgeon (Pseudorasbora pumila), and for wintering waterbirds. Some 50,000 waterbirds have been recorded at the Site, including about 15% of the flyway population of the Tundra swan (Cygnus columbianus). White-tailed sea eagle (Haliaeetus albicilla) and Steller’s sea eagle (Haliaeetus pelagicus) are also present, both of which are listed as vulnerable on the National Red List and are included in the List of Natural Monuments of Japan. East Indian lotus (Nelumbo nucifera) cover most of the water surface, in particularly of the Oyama Kami-ike pond. The Site has been designated as a Special Protected Zone within the National Wildlife Protected Area. There is a management plan in place.

Administrative region: 
Yamagata Prefecture/ Tohoku Region

  • National legal designation: 
    • Nationally designated site - Special Protection Area of National Wildlife Protection Area
  • Last publication date: 


Ramsar Information Sheet (RIS)

Additional reports and documents