The Dinka people are an ethnic group inhabiting the Bahr el Ghazal region of the Nile basin, Jonglei and parts of southern Kordufan and Upper Nile regions. The Dinkas are mainly agripastoral people, relying on cattle herding at riverside camps in the dry season and growing millet (awuou) and other varieties of grains (rap) in fixed settlements during the rainy season. They number around 4.5 million people according to the 2008 Sudan census, constituting about 18% of the population of the entire country, and the largest ethnic tribe in South Sudan. Dinka, or as they refer to themselves, Muonyjang (singular) and jieng (plural), one of the branches of the River Lake Nilotes (mainly sedentary agripastoral peoples of the Nile Valley and African Great Lakes region who speak Nilotic languages, including the Nuer and Luo). Dinka are sometimes noted for their height. With the Tutsi of Rwanda, they are believed to be the tallest people in Africa. Roberts and Bainbridge reported the average height of in a sample of 52 Dinka Ageir and in 227 Dinka Ruweng measured in 1953–1954. However, it seems the stature of today's Dinka males is lower, possibly as a consequence of undernutrition and conflicts. An anthropometric survey of Dinka men, war refugees in Ethiopia, published in 1995 found a mean height of . Other studies of comparative historical height data and nutrition place the Dinka as the tallest people in the world.