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The Geographical Location of the Jaredites/Olmecs

“…Jared came forth with his brother and their families, with some others and their families, from the great tower, at the time the Lord confounded the language of the people…"  (Ether 1:33)
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The Jaredites came from the Tower of Babel.
Note:  "...the Lord scatter them abroad upon the face of all the earth." (Genesis 11:9)
Evidence indicates that the “tower of Babel” was located in Mesopotamia.

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The Jaredites crossed the sea.  (Ether 6:5)
After leaving the Eastern Hemisphere and crossing the sea they landed in the "promised land".
(Ether 6:12) That is the Land that was promised to the Jaredites.  
The Book of Mormon then indicates that just like the Mormons who entered the land of Utah, or like the first Pilgrims who came to the east coast of the now United States, one of the first things that the Jaredites did, like the early Mormons or Pilgrims, was they began to "till the earth" and live in that location.  (Ether 6:13)
Therefore, the oblivious place for them to settle would have been next to the sea that they had just crossed.
The major population area, archaeological ruins and cities of the Jaredites/Olmecs people would be of course mapped next to the "sea", as shown on the following map.

The Jaredites/Olmecs oldest and main populated region located next to a "sea".
These Ancient "Cities" date exactly to the Book of Mormon Jaredite time period.
In 1830 A.D., when the Book of Mormon was first published, no one in the world knew the dates of occupation of these Ancient Cities.
These Ancient Cities had to have had 10's of 1,000's of people occupying each major City.
 

"And it came to pass that his father did build up many cities upon the face of the land, and the people began again to spread over all the face of the land."  (Ether 10:4)

   

<<The Jaredites/Olmecs "spread over all the face of the land."
Map from; (Latin American Studies)    

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The Jaredites civilization lasted over 2000 years. During this time there is evidence that the Jaredite people spread outward as far north as the United States, and as far South as Peru. 
See: The Jaredites/Olmecs...of Mesoamerica