There are many but the major ones are regarding, Construction, pollution, evaporation and salinization. The links below will give further information. However the threat that is 'invisible' is the evaporation and salinization whereby the Nile water is bringing more salt to the fields of Egypt because of the increased evaporation of water from Lake Nasser. As the evaporation takes place salts are left behind in a more concentrated form and as the water irrigates the land there is an excessive accumulation of salts.
Nile River
The Nile River. or River Nile
Nile.
the major river systems have to do with the Nile river. the Nile river provided transportation, water, and also allowed agriculture to take place. Also Nile river was the reason why Egypt is called "the gift of the Nile."
River Nile , White Nile ,and the Blue Nile River Nile , White Nile ,and the Blue Nile
the nile is longer
The Nile river.
River Nile
The Nile River.The Nile.
The Blue Nile and the White Nile.
The Nile River runs from the north to the south of Egypt.
Nile is not a country; it is a major river in North Africa.