Which of the following is not a way that Egypt was protected by its geographic features? The Mediterranean Sea made it difficult for invaders to come from the North.
There was a large desert to the East that attackers could not cross.
The large civilization to the South intimidated any potential invaders.
The Nile river contains many dangerous rapids that made it impossible for ships to navigate.

(Do not write a comment then delete it its just plain annoying)

The "red land" was the barren desert that protected Egypt on two sides. It acted as a natural barrier from invaders. They used the Nile's floods to their advantage. Every time the Nile flooded, it deposited silt in the soil, which made the soil great for growing crops.

Explanation: i learned about this last year

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain