The document summarizes key facts about the River Nile, including that it is approximately 6,650 km long and located across multiple African countries. It flows north through Egypt and is the longest river in the world. The two major tributaries, the Blue Nile and White Nile, merge in Sudan to form the Nile. The Blue Nile originates in Ethiopia's Lake Tana and flows west, while the White Nile starts in Burundi and Rwanda and flows north through lakes and borders before entering Lake Victoria. The Nile has historically supported agriculture and civilization in Egypt.