Oceans are some of the natural barriers in the planet.
Barrier of death
Sahara Desert, Sahel, Savanna.
skin acts as a natural barrier against harmful stuff :) So do tears, sweat and the stomach :)
Your skin and your immune system are some of theh best natural barriers against germs.
The Natural Barriers in canada are Molten lava and cars
Oceans are some of the natural barriers in the planet.
The natural barriers and isolation allowed China to
no natural barriers are rivers, cliffs...... natural stuff not man made
Mountains and oceans are the natural barriers of western africa
unpredictable flooding of natural barriers for protection . Natural Resources limited.
monsoons
The body has a number of natural barriers, your skin, your eyelashes, mucus and even tears are all natural barriers to name but a few.
One of japans natural barriers is that japan is very mountainous. This could also be good for japan in case of a foreign invasion.
Their natural barriers surrounded them so they considered themselves to be in the middle of the world.
Most of the borders of the U.S. are marked by oceans; the next most frequent natural barriers are rivers.
Egypt's Natural Barriers are The Nile River, Sand Dunes, And The Desert. :) Enjoy >.<