KAJAKI, AFGHANISTAN - MARCH 13:  British commandos descend from a mountain observation post overlooking the beginning of the Helmand River at the Kajaki hydroelectric dam March 13, 2007 in Afghanistan's southern Helmand province. Some 4,500 NATO forces are battling Taliban in the area as part of Operation Achilles, the largest NATO operation yet in Afghanistan. The main objective of the offensive is to clear Taliban from the area in order to upgrade the dam, which currently provides electricity to much of southern Afghanistan. The USAID funded project would be one of the largest development projects in Afghanistan, providing electricity to millions more Afghans. Earlier work on the dam, which was built by the United States in 1975, was suspended June 4, 2006 due to Taliban attacks.  (Photo by John Moore/Getty Images)
The source of the Helmand river at the Kajaki hydroelectric dam in Afghanistan's southern Helmand province. Getty Images

Iran and Afghanistan face off over sharing Helmand waters

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