Its width varies greatly over its length and it's very difficult to be precisely. It varies from say about 350 meters to over 7.5 Km with an average of 2.8 kilometres. However the Nile has to go through a 7 meter wide gap at the Murchison Falls in Uganda and the delta covers about 240 Km of coastline.
The River Nile is approximately 8 kilometers (5 miles) wide, though like any river this will vary from place to place.
The middle course of the Nile River runs through Sudan, starting at the city of Khartoum where the White Nile and Blue Nile converge. This section of the river is characterized by wide floodplains and fertile agricultural land.
Nile River
Egypt has only one river - the river Nile, the longest river in the world.
Nile River
The width of the Nile River varies significantly along its course. In some areas, it can be as narrow as 0.25 miles (about 1,320 feet), while in others, it can expand to widths exceeding 2 miles (over 10,560 feet). Generally, the average width of the river is around 1 mile (approximately 5,280 feet).
Egypt's Nile River is probably the most significant of these.
The Nile River.
The River Nile flows through Cairo, Egypt.
wide river valleys
Given the Nile is over 4,000 miles long it is impossible to answer this question precisely. However the Nile Delta is 160 km in length by some 240 km of coastline. The links below provide more information. The River Nile is widest at Edfu, with a width of 7.5 km.
Nile River.