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Satellite image of Hachirōgata (at right). The lake is entirely reclaimed except the south-east corner and the narrow watercourse surrounding the reclaimed land. Oga Peninsula is in the left.
|Surface area||48.3 km²|
|Surface elevation||-4 m|
Hachirōgata (八郎潟) is a lake in the Akita Prefecture in northern Japan. Its formal name is Lake Hachirō (八郎湖 Hachirō-ko), but it is also called Hachirōgata Regulating Pond (八郎潟調整池 Hachirōgata chōseichi). At 4 meters below sea level, Hachirōgata is now the lowest point in Japan.
Hachirōgata was the second-largest lake in Japan after Lake Biwa. Extensive reclamation began in 1957 for crop production, and Ōgata village was established on the reclaimed land on October 1, 1964. The remaining lake has an area of 48.3 km2 (19 sq mi) (18th largest in Japan).
Fishery of shijimi shells (Corbicula japonica) was a thriving industry, but it decreased as the lake became less brackish. In the winter, people fish wakasagi (Hypomesus nipponensis) by hollowing out the frozen surface. Today, black bass fishing attracts tourists even outside the prefecture, though some suspect that indigenous species are threatened by the invasion of the extraneous fish.
According to a legend, a man called Hachirō who was transformed into a dragon chose the lake for his home after wandering a long time. Thus, the lake was named Hachirōgata (-gata means "lagoon"). Later, he was attracted to a woman who owned Lake Tazawa, another lake in Akita Prefecture, and moved to be with her. After that, Hachirōgata became increasingly shallower.