Nile Valley and Great Lakes peoples (Dinka, Nuer, Shilluk, Luo, Maasai, Kalenjin and related groups) speaking Nilotic languages; proto-Nilotic identity emerged in present-day South Sudan by the 3rd millennium BCE, with major southward migrations into the Sudd/South Sudan (5th-11th c. CE) and onward into the East African highlands and Rift Valley accelerating from the 13th century.
Not an ending: Nilotic peoples — Dinka, Nuer, Shilluk, Luo, Maasai, Kalenjin and kin — remain the majority of South Sudan and major nations of East Africa. The map hands off to the modern states of the region.
Ethnographic Survey of Africa volume on the Nilotic peoples' social and political organization prior to and during the colonial period.