Lakes Oyama Kamiike and Shimoike

Country/territory: Japan

IBA Criteria met: A4i, A4iii (2004)
For more information about IBA criteria please click here

Area: 970 ha

Wild Bird Society of Japan
Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2010 low not assessed low
For more information about IBA monitoring please click here

Site description
The lakes are located in the northwest of Yamagata Prefecture. Lake Oyama Shimoike is at the foot of Mt Takadateyama, while Lake Oyama Kamiike is at the foot of Mt Hachimoriyama. Both lakes are farm-ponds used for irrigation surrounded by these mountains. Both lakes attract many swans and wild ducks in winter. The number of Mallards, in particular, counts as many as 60,000 in total, of which 20,000 concentrate in Oyama Kamiike, and 40,000 in Oyama Shimoike.

Recommended citation
BirdLife International (2023) Important Bird Areas factsheet: Lakes Oyama Kamiike and Shimoike. Downloaded from on 27/01/2023.