Japan / Chugoku Region /

JP126Lake Kojimako, Lake Abeike

Site Description


Kojimako is a shallow lake stretching from Okayama City to Tamano City in Okayama Prefecture, with an area of 1,088 ha and average depth of 2.4 m. The lake is an artificial desalinated lake created in 1962 by separating a part of the Kojima Bay with a drainage gate. In 1975, Chemical Oxygen Demand (COD) had deteriorated to 11 ppm. But, due to various efforts made thereafter including the creation of artificial reed beds and the dredging of sludge silted on the bottom of the lake, the COD figure has decreased to around 9 ppm. The number of wintering ducks visiting this site exceeds 40,000.

Area & Coordinates

1,000ha 34°35′N 133°57′E
region: Chugoku Region, Okayama



Designation Type

Wildlife Protection Area (Local)

Protection Status


Conservation issues


Tachybaptus ruficollis, Podiceps cristatus, Phalacrocorax carbo, Nycticorax nycticorax, Egretta alba, Tadorna tadorna, Anas penelope, Anas acuta, Pandion haliaetus, Circus spilonotus, Falco tinnunculus, Fulica atra, Sterna albifrons, Asio flammeus, Alauda arvensis, Hirundo daurica, Acrocephalus arundinaceus, Cisticola juncidis, Emberiza fucata, Emberiza schoeniclus



©Okayama Digital Museum

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Copyright Wild Bird Society of Japan (WBSJ)