The Shilluk are the most northern Nilotic-speaking people in modern Africa. Shilluk country covers approximately 320 kilometers on the west bank of the White Nile, from 10° to 12° N and from 30° to 33° E. Shilluk oral traditions, however, indicate that at some time in the past their country reached to the confluence of the Blue and White Niles, the site of the modern city of Khartoum. At the time of the last official census (1956), the Shilluk were estimated to number 120,000 individuals. Most of Shilluk country is open savanna and free from the annual floods of the White Nile. The Shilluk language is most closely related to Anuak. Together, the two languages comprise a subfamily of the larger classification of Nilotic, which is spoken by different cultural groups throughout eastern Africa.