by Tanzania, Uganda, and Kenyais sometimes informally described as the source, because it feeds the White Nile from its outflow at Jinja, Uganda. However, some have suggested that the genuine source of the Nile is the rain clouds that are often found above Lake Victoria, because they contribute the vast majority of the lake's water.

The source of the Blue Nile tributary is near the town of Gish Abay, south of Lake Tana.