1) savanna
2) delta
3) cataracts
4) annual floods
Hope this helpeed! (:
Egypt's Natural Barriers are The Nile River, Sand Dunes, And The Desert. :) Enjoy >.<
Tigris and Euphrates Rivers are one of them
Nile River and the Sahara Desert were important natural barriers that kept the Egyptian people safe from invaders. I hope the information works for you.
The occurrence of natural barriers, during the Harappan period would have been an annual inundation of the sites as the natural reservoir engulfing them grew with run-off from Himalayas.
One of those may be a "fall line". A point in the river where rocks, rapids, or waterfalls prevent movement by river. Richmond VA is located at the Fall Line of the James River. Sea going ships can navigate up the river to Richmond, but no further.
There were deserts to the west and east of the Nile River. There were mountains to the south. This kept Egypt safe from other civilizations.
Egypt
peace river is located in Alberta saskachewan?
The Cheviot Hills and the River Tweed. Hadrian's Wall may not be as natural but it is 75 miles long and built by the Romans. It borders England and Scotland.
Rivers provide water and fertile soil left behind after the rivers flood. Also, rivers are natural barriers.
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The address of the Mojave River Natural History Assoc is: 14651 Cedar Circle, Hesperia, CA 92345