The Iran–Turkmenistan Friendship Dam or Doosti Reservoir Dam (Persian: سد دوستی, Turkmen: Dostluk Suw Howdany) is a dam on the Hari River (Hariroud), which forms part of the international boundary between Iran and Turkmenistan (Iran-Turkmenistan border).

The dam was completed in 2004, and both countries agreed that each would have an equal right to the waters of the river, which amount to 820 million cubic metres.

[4] The dam provides drinking water and irrigation for the surrounding areas along with hydroelectric power.

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