The Nile is traditionally considered the longest river in the world. It is commonly measured at about 6,650–7,088 kilometres, depending on which headwaters and measuring methods are used.
The river flows north through northeastern Africa and empties into the Mediterranean Sea. Its two major tributaries are the White Nile and the Blue Nile. They meet at Khartoum, Sudan, before the combined river continues through Egypt. The White Nile is generally treated as the longer headwater, while the Blue Nile supplies much of the Nile’s seasonal flow from the Ethiopian Highlands.
The answer is sometimes debated because river length depends on where a river’s source begins, where its mouth ends, and how its winding course is measured. Some studies have argued that the Amazon is longer under particular definitions, but the Nile remains the traditional and widely accepted answer to this wording. The Nile is also famous for its importance to ancient Egyptian civilization and agriculture.