Question

how was ancient Egypt was isolated from other cultures by natural borders

Answer 1

Ancient Egypt and advantage of the protection by natural border. On the east side there was a small desert which plays the role to separate the area from Red Sea. While on the west the famous Sahara desert gives the Egypt a natural border. In order to separate the country from the European countries there was Mediterranean Sea on the North side of the country. While from South side mountains made a perfect border for the valley.

Answer 2

On one side it had the Nile which was difficult to cross if the Egyptians didn't want people to cross it. On two sides there was a desert and one the north there was the sea. If Egypt wanted to isolate itself or be defensive in a war it had no problems doing so. It could easily restrict access of foreign cultures.