Because they could be used for building and the river was the only source of water and mud.
The Great Pyramid consists of more than 2.3 million limestone blocks. The Egyptians shipped the limestone blocks from quarries all along the Nile River. The stone was cut by hammering wedges into the stone. Next the wedges were soaked with water. The wedges expanded, causing the rock to crack. Once they were cut, they were carried by boat either up or down the Nile River to the pyramid.
the nile river was made by a ditch
the nile river was made of water
Basic materials near the Nile River. Stones were made out of clay: water, mud, sand
Stone blocks
It was the Nile crocodile.
stone it says in the title "the STONE river"
The pyramid is man made, the Nile is a river and a natural phenomenon.
The Nile River was the main water and food for the Egyptians, who made the pyramids, so, yes, I guess so.
Egyptian boats were used for taking great pharaohs to funeral's, and transporting the sun dried mud bricks to the pryamid building site.
The Nile River divides into two segments. The White Nile and the Blue Nile. Both rivers main source is the original Nile River. In case your wondering, the Nile River is on the East side of Africa.
it made food and produced floods