Question

Menes the king of upper Egypt united the two regions of upper Egypt and lower Egypt what feature served as a highway linking the two regions

Answer 1

its the Nile river it runs though both and its the only rive the flows North

Answer 2

The Nile river
River originating in central Africa and flowing north to the Mediterranean Sea, with its delta in Egypt. The Nile proper is formed by the joining of the Blue Nile, which flows from Ethiopia, and the White Nile, which flows from Lake Victoria.