This is the official map that shows the territory where The Forrest Fenn hidden treasure may be hidden. It is still a big area, but it definitely narrows things down to portions of only four states.
So your efforts on The Thrill of the Chase should only be on places within the map boundaries.
Within the map is the poem Found in The Thrill of the Chase. It is supposed to contain all of the clues treasure hunters need to find the chest full of gold and other things