Khoda Afarin Dam (also spelled as Khodaafarin Dam or Hudafarin Dam) is an earth-fill embankment dam on the Aras River straddling the border between Iran and Azerbaijan. It is located 8 kilometres (5.0 mi) west of Khomarlu in East Azerbaijan Province, Iran and 14 kilometres (8.7 mi) southwest of Soltanlı in Jabrayil District, Azerbaijan. It is located 1 kilometre (0.62 mi) upstream of the Khodaafarin Bridges. The purpose of the dam is hydroelectric power generation and irrigation. It was conceived as a joint project with the Soviet Union and both sides reached an agreement in October 1977. Designs were finalized in 1982, revised in the early 1990s and construction began in 1999.