The Nile cataract is known as shallow waters in a river. This is usually seen in white or fast moving waters.
A cataract.
It is the first Cataract in Aswan
in nubia
Aswan,It stands on the east bank of the Nile at the first cataract and is a busy ... Aswan is the ancient city of Swenet, which in antiquity was the frontier town ... the Nile in the south, Swenet was the first town in the country, and Egypt
At Aswan.
Khartoum is the city located south of the 6th cataract!
CAtaract
Cataracts of the Nile are white water rapids of the Nile River, between Aswan and Khartoum.
cataract
the area is 200mi also it is part of Nubia
About 900 miles
There are no absolutes and the link below will give overall information.