The Ruvyironza (or Luvironza) River is a river in Africa that is considered by some to be the most remote source of the Nile,^[1] the world's longest river. It rises on Mount Kikizi in Burundi, and flows over the Rurubu River into the Kagera River in Tanzania,^[2] and from there into Lake Victoria. With a total length of 182.4 km (113.3 mi).^{[clarification needed]}