The Nuer people are a Nilotic ethnic group concentrated in the Greater Upper Nile region of South Sudan. They also live in the Ethiopian region of Gambella. The Nuer speak the Nuer language, which belongs to the Nilotic language family. They are the second-largest ethnic group in South Sudan and the largest ethnic group in Gambella, Ethiopia. The Nuer people are pastoralists who herd cattle for a living. Their cattle serve as companions and define their lifestyle. The Nuer call themselves "Naath".