Question: Where is the mountain in Geogia from which the Appalachian National Scenic Trail started and extended up to Mount Katahdin in Maine?

Context paragraphs:
Metacomet-Monadnock Trail: The Metacomet-Monadnock Trail (M&M Trail) is a 114 mi hiking trail that traverses the Metacomet Ridge of the Pioneer Valley region of Massachusetts and the central uplands of Massachusetts and southern New Hampshire.  Although less than 70 mi from Boston and other large population centers, the trail is considered remarkably rural and scenic and includes many areas of unique ecologic, historic, and geologic interest.  Notable features include waterfalls, dramatic cliff faces, exposed mountain summits, woodlands, swamps, lakes, river floodplain, farmland, significant historic sites, and the summits of Mount Monadnock, Mount Tom and Mount Holyoke.  The Metacomet-Monadnock Trail is maintained largely through the efforts of the Berkshire Chapter of the Appalachian Mountain Club (AMC).  Much of the trail (but not all) is a portion of the New England National Scenic Trail.

Appalachian Trail: The Appalachian National Scenic Trail, generally known as the Appalachian Trail or simply the A.T., is a marked hiking trail in the Eastern United States extending between Springer Mountain in Georgia and Mount Katahdin in Maine.  The trail is about 2,200 miles (3,500 km) long, though the exact length changes over time as parts are modified or rerouted.  The Appalachian Trail Conservancy claims that the Appalachian Trail is the longest hiking-only trail in the world.  More than 2 million people are said to do at least one day-hike on the trail each year.

New England National Scenic Trail: The New England National Scenic Trail (NET) is a National Scenic Trail in southern New England, which includes most of the three single trails Metacomet-Monadnock Trail, Mattabesett Trail and Metacomet Trail.  After the Metacomet-Monadnock-Mattabesett trail system, the trail is sometimes called the Triple-M Trail.  The 215 mi route extends through 41 communities from Guilford, Connecticut at Long Island Sound over the Metacomet Ridge, through the highlands of the Pioneer Valley of Massachusetts, to the New Hampshire state border.  (The remainder of the M-M Trail to the summit of Mount Monadnock in southern New Hampshire is not included in the designation.)  This includes a now (2013) complete connector trail (the Menunkatuck Trail) from the southernmost location of the Mattabesett Trail (in northern Guilford, Connecticut) to the sea (Long Island Sound) and a deviation of the Metacomet-Monadnock Trail in Massachusetts, to lead the trail through state-owned land instead of largely unprotected land.

Natchez Trace Trail: The Natchez Trace Trail is a designated National Scenic Trail in the United States, whose route generally follows sections of the 444 mi Natchez Trace Parkway through the states of Tennessee, Alabama, and Mississippi.  The Natchez Trace Trail is not envisioned as a long, continuous footpath, as is the case with other national scenic trails (such as the Appalachian Trail); rather, only a limited number of trail segments along the route, currently over 60 mi of trail, have been developed for hiking and horseback riding.  Moreover, the Natchez Trace Trail, unlike many others that rely heavily on volunteers for trail construction and maintenance, is managed and maintained by the National Park Service.  Sections of the trail follow along the Natchez Trace Parkway road shoulder, and cross county and state roads.

Springer Mountain: Springer Mountain is a mountain located in the Chattahoochee National Forest on the border of Fannin and Gilmer counties.  Located in the Blue Ridge Mountains in northern Georgia, the mountain has an elevation of about 3782 ft .  Springer Mountain serves as the southern termini for the Appalachian and Benton MacKaye trails.

Arizona Trail: The Arizona National Scenic Trail is a National Scenic Trail from Mexico to Utah that traverses the whole north–south length of the U.S. state of Arizona.  The trail begins at the Coronado National Memorial near the US–Mexico border and moves north through parts of the Huachuca, Santa Rita, and Rincon Mountains.  The trail continues through the Santa Catalina north of Tucson and the Mazatzal Mountains before ascending the Mogollon Rim north of Payson, eventually leading to the higher elevations of Northern Arizona and the San Francisco Peaks.  The trail then continues across the Coconino Plateau and in and out of the Grand Canyon.  The Arizona Trail terminates near the Arizona-Utah border in the Kaibab Plateau region.  The 800 mi long Arizona Trail was completed on December 16, 2011.  The trail is designed as a primitive trail for hiking, equestrians, mountain biking, and even cross country skiing, showcasing the wide variety of mountain ranges and ecosystems of Arizona.

Bear Mountain (Connecticut): Bear Mountain, is a prominent peak of the southern Taconic Mountains.  It lies within the town of Salisbury, Connecticut, in the United States, and is the highest mountain "summit" in the state of Connecticut.  The highest "point" in the state, however, is located on the south slope of Mount Frissell 1.3 mi to the west at 2379 ft .  Much of the mountain is protected as part of the viewshed and corridor of the Appalachian National Scenic Trail, which crosses the summit grounds.  From the summit the view includes Twin Lakes and cultivated fields to the east, the Catskills and nearby Taconic peaks to the west, and Massachusetts' Mount Everett and Mount Race to the north.  Though the mountain's elevation is commonly reported at 2316', the elevation near its stone monument tower, the proper summit lies approximately 125 feet northwest of the tower, accessible by a herd path following the mountain's abandoned Bee Line Trail to the Northwest Camp owned by the Connecticut Chapter of the Appalachian Mountain Club.  The mountain is noted for its old growth scrub forest of pitch pines, birch, oak and other short-statured trees, much like its neighbors, Mounts Everett and Race, for its numerous wild blueberry bushes which produce in late July and early August, and for its rattlesnakes, which in summer are sometimes seen sunning themselves on the mountain's numerous open rocks of mica, schist and gneiss.

Florida Trail: The Florida Trail is one of eleven National Scenic Trails in the United States.  It currently runs 1000 mi , with 300 mi planned, from Big Cypress National Preserve (between Miami and Naples, Florida along the Tamiami Trail) to Fort Pickens at Gulf Islands National Seashore, Pensacola Beach.  Also known as the Florida National Scenic Trail (which applies only to its federally certified segments), the Florida Trail provides permanent non-motorized recreation opportunity for hiking and other compatible activities and is within an hour of most Floridians.  The Florida National Scenic Trail is designated as a National Scenic Trail by the National Trails System Act of 1968 (Public Law 90-543).

Appalachian Trail by state: The Appalachian National Scenic Trail spans fourteen U.S. states during its journey that is 2189 mi long, including Georgia, North Carolina, Tennessee, Virginia, West Virginia, Maryland, Pennsylvania, New Jersey, New York, Connecticut, Massachusetts, Vermont, New Hampshire, and Maine.  It begins at Springer Mountain, Georgia, and follows the ridgeline of the Appalachian Mountains, crossing many of its highest peaks and running with only a few exceptions almost continuously through wilderness before ending at Mount Katahdin, Maine.

Continental Divide Trail: The Continental Divide National Scenic Trail (in short Continental Divide Trail (CDT)) is a United States National Scenic Trail running 3,100 miles between Mexico and Canada.  It follows the Continental Divide of the Americas along the Rocky Mountains and traverses five U.S. states — Montana, Idaho, Wyoming, Colorado, and New Mexico.  In Montana it crosses Triple Divide Pass (near Triple Divide Peak which separates the Hudson Bay, Atlantic Ocean and Pacific Ocean drainages.) The trail is a combination of dedicated trails and small roads and considered 70% complete.  Portions designated as uncompleted must be traveled by roadwalking on dirt or paved roads.  This trail can be continued north into Canada to Kakwa Lake north of Jasper National Park by the Great Divide Trail, which is so far described only in a few books and carries no official Canadian status.

Supporting paragraphs: Appalachian Trail Springer Mountain
Answer: Chattahoochee National Forest