Onbara Dam

LocationOkayama Prefecture, Japan

Coordinates35°18′01″N 133°59′15″E / 35.30028°N 133.98750°E / 35.30028; 133.98750

Onbara Dam
Location	Okayama Prefecture, Japan
Coordinates	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.