Where today is one of the driest regions on earth, the eastern Sahara, during the Ice Age flowed the eight-hundred-mile-long Yellow Nile from the Ennedi plateau of northeastern Chad due east across northern Sudan into the Nile River at Dongola in the kingdom of Kush, the Yellow Nile drainage now called the Wadi Howar which was completely dried-up by around 1000 b. c.