how longe nile sea in africa?

Answer 1

I suggest that you intend to mean Nile River,a river in Africa regarded by most authorities as being the longest river on Earth. its length is recorded as 6,695 km (4,160 mi).
The Nile has two distinct tributaries, the White Nile and Blue Nile, the former being the longer of the two. The White Nile rises in the Great Lakes region of central Africa, with the most distant source in southern Rwanda, and flows north from there through Tanzania, Lake Victoria, Uganda and southern Sudan, while the Blue Nile starts at Lake Tana in Ethiopia, flowing into Sudan from the east. The two sections meet near Khartoum.The northern section of the river flows almost entirely through desert, from Sudan into Egypt Nile ends in a large delta that flows into the Mediterranean Sea.

Answer 2

Nile (nīl) pronunciation

The longest river in the world, flowing about 6,677 km (4,150 mi) through eastern Africa from its most remote sources in Burundi to a delta on the Mediterranean Sea in northeast Egypt. The main headstreams, the Blue Nile and the White Nile, join at Khartoum in Sudan to form the Nile proper. The river has been used for irrigation in Egypt since at least 4000 B.C., a function now regulated largely by the Aswan High Dam.