re: Best camping sites in Ga,AL,TN?

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what is the green area?

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I think that would be mostly considered to be The Cumberland Plateau. Just guessing though, because that would mean that The Cumberland Plateau includes more area than I thought.
Going to modify my answer, that is the area that feeds the Tennessee River,maybe? The Eastern Line would be off quite a bit though.
Maybe the line represents different water flow dividing lines, but some of the area included in green,(on the eastern side) would actually be part of the Coosa and Tallapoosa River system, and end up flowing to the Gulf Of Mexico.