Onbara Dam

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Dam in Okayama Prefecture, Japan

35°18′01″N 133°59′15″E / 35.30028°N 133.98750°E / 35.30028; 133.98750

Onbara Dam (Japanese: 恩原ダム) is a dam in the Okayama Prefecture, Japan, completed in 1927.^[1]

The Onbara Dam is the oldest existing buttress dam for power generation.

It is unknown if or how many buildings were submerged in the construction of the dam.