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Have you heard of the theory ofone soid land mass. When I was a child years and years ago they had us to cut out all the continents on the map of the world and it all its fairly close together take into account erosion
thats called pangea, and im realativley certain that it is the way things used to be also, but it predates human history by a couple millenia.
mostly the walked, we are relatively sure that it has not been very long since the bering strait was not covered in water, providing a land bridge between siberia and alaska.
bering straitonce you make it to alaska, if you follow the coastline only you could walk (well maybe YOU couldn't) all the way to the southernmost tip of south america, and never have to cross water!!!