The Gademotta Formation in the Main Ethiopian Rift Valley is known for its Middle Stone Age archaeological sites. It is located west of Lake Ziway. In addition to the type-site, which assumes the same name, the formation contains a cluster of sites at Kulkuletti, some 2.5 kilometres (1.6 mi) away. The near-lake environment and locally available obsidian may have attracted the continuous/repeated occupation of the area by Middle and Late Pleistocene hominins.