Question: What  is one of the five ranger districts of the Chattahoochee National Forest that has a mountain located in the Chattahoochee National Forest on the border of Fannin and Gilmer counties in the district, along with a portion of the Toccoa River? 
Sentence (from "Springer Mountain"): Springer Mountain serves as the southern termini for the Appalachian and Benton MacKaye trails.
Relevant evidence: No