Before revision: The country's longest river is the Nyabarongo, which rises in the south-west, flows north, east, and southeast before merging with the Akanyaru to form the Akagera; the Akagera then flows due north along the eastern border with Tanzania.
After revision: The country's longest river is the Nyabarongo, which rises in the south-west, flows north, east, and southeast before merging with the Akanyaru to form the Kagera; the Kagera then flows due north along the eastern border with Tanzania.