Ayun Hạ Reservoir or Ayun Hạ Lake () is an artificial lake in Gia Lai Province, Vietnam. The lake was formed when the Ayun River was stopped early in 1994, to start the construction of a dam and lake for irrigation. The flooded area of the lake district belongs to the commune of HBong Chu Se.
The lake has a surface area of , and has a length of , and is at its widest.
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