Here is a well known map of the Mississippi, then known as the HIO river.
Yes, the OHIO is the upper HIO.
This was found in a cavern/tomb in Illinois in the 1980's.
While I will not spend time explaining everything here. I will sight one example from it.
The lower left side of the stone you will see a tributary and a lake.
The writing next to it reads (Pronounced) Chet Taw Leg - which is today Lake Ouachita.
Chet as a meaning here is a stone fortress which is also found just to the north which is Hot Springs in the Ozarks. 'leg is a body of water with a output stream So the full meaning of the text is Stone Fortress by the lake. Please read the old history of that area for it is huge.
And it is disgraceful the officers of the government set to destroy the entire native community and culture in the 1800's. So much lost.
And the language as used here is around 300bc - 300 AD
Oh... you might also notice a cave symbol along the Ohio river, known today as 'cave-in-rock' and is still there. The other strange looking fence symbol to the north of it is a representation of where the cave is that this artifact was found. It too is known as a chet in symbol form.
Just thought you might find it interesting.
