Because it can be really big and it will take years maybe months to cross a desert by foot
The Himalayan mountain range forms a natural barrier between China and Mongolia.
Sahara
Desserts aren't natural.
A desert, mountain range, or a jungle could be. : )
Egypt's Natural Barriers are The Nile River, Sand Dunes, And The Desert. :) Enjoy >.<
The sand dunes act as a natural barrier, blocking strong winds.
Natural wonders in Australia include:Uluru (Ayers Rock)Great Barrier ReefWave RockPinnacles Desert
The great crater of N'dambulukawa
No natural barrier completely protected Egypt from invasion as all of these difficulties were eventually overcome, but some of the natural barriers that substantially minimized foreign invasions were: the Sahara Desert, the Red Sea, the Sinai Desert, and the Mediterranean Sea. (Amphibious assaults were usually not terribly successful at this period.)
The Sahara Desert, but if you really need to refer to this website to answer that, you may want to get some tutoring! It's not that hard!
The natural barrier that protected Egypt in the south is cataracts.
The natural barrier that protected Egypt in the south is cataracts.