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Hadar, site of paleoanthropological excavations in the lower Awash River valley in the Afar region of Ethiopia. It lies along the northernmost part of Africa’s Eastern (Great) Rift Valley, about 185 miles (300 km) northeast of Addis Ababa. The lower valley of the Awash River—i.e., the Hadar area—was designated a UNESCO World Heritage site in 1980. The Hadar remains include partial skeletons of Australopithecus afarensis, a key species in human evolution. Major paleontological work began...