The Eastern Nilotic languages are one of the three primary branches of the Nilotic languages, themselves belonging to the Eastern Sudanic subfamily of Nilo-Saharan; they are believed to have begun to diverge about 3,000 years ago, and have spread southwards from an original home in Equatoria in South Sudan. They are spoken across a large area in East Africa, ranging from Equatoria to the highlands of Tanzania. Their speakers are mostly cattle herders living in semi-arid or arid plains.