Multiple choice general knowledge What is "The Blue Nile"? A tributary of the Nile River A River itself An England river These are all correct Reveal answer Fill a bubble to check yourself A Correct answer Explanation The Blue Nile is a major tributary of the Nile River, originating at Lake Tana in Ethiopia. It contributes approximately 80% of the Nile's water supply and joins with the White Nile in Khartoum, Sudan, to form the main Nile River.