Region containing several archaeological sites found in 1960 in the Borkou-Ennedi-Tibesti Province near Koro Toro (KT) in northern Chad, dated to 3.5-3.0 mya, and that contains hominid remains, including a partial mandible attributed to Australopithecus bahrelghazali from site KT 12. Paleoenvironment was a lakeside forest with patchy grass arenas. In Arabic, the name means river of the gazelles. The most notable of at least 17 sites. Aka Koro Toro, Yayo.