The Blue Ridge basement rock is made of gneisses and granitoids - orthopyroxene-bearing charnockites among them - emplaced during the Grenville orogeny more than a billion years ago. When these mountains first rose, they were among the highest in the world, comparable in stature to the much younger Alps. A billion years of weathering, erosion, and mass wasting have shaved them down to their current dimensions. The highest peak, Mount Mitchell in North Carolina at 6,684 feet, is what a survivor looks like. About 125 Blue Ridge peaks exceed 5,000 feet, and 39 of those (all in North Carolina and Tennessee) clear 6,000. By comparison, in the entire northern Appalachian chain, only New Hampshire's Mount Washington reaches that altitude. "Southern Sixers" is the term peak baggers use for this concentrated stretch of high country.

Within the Blue Ridge province sit two major national parks: Shenandoah in the northern section and Great Smoky Mountains in the southern. The Blue Ridge Parkway, 469 miles of two-lane road built between 1935 and 1987, threads the ridge crest between them - America's longest linear park, and arguably its most beautiful. The Appalachian Trail runs the same general line on foot. Eight national forests, including Pisgah, Nantahala, Cherokee, and George Washington and Jefferson, blanket the surrounding slopes. In places along the Parkway the cut rock exposes folded bands of light and dark gneiss that look like marble cake - a billion-year-old metamorphic stripe pattern visible from a parked car.

At the foot of the Blue Ridge, the Siouan-speaking Manahoacs, the Iroquois, and the Shawnee hunted and fished for centuries. A German physician-explorer named John Lederer reached the crest in 1669, recording the Virginia Siouan name *Ahkonshuck*. The Treaty of Albany, negotiated between 1718 and 1722 by Virginia Lieutenant Governor Alexander Spotswood, made the Blue Ridge a political boundary - Iroquois lands to the west, Virginia colony to the east. When colonists started ignoring that line and pushing into the Shenandoah Valley in the 1730s, the Iroquois sold the valley itself at the Treaty of Lancaster in 1744. The ridge had become a border, and then it stopped being one, all within a single generation.

The Blue Ridge climate is too warm to support an alpine zone - statistical models predict the tree line in these latitudes would have to be above 7,985 feet, and nothing here is that tall. The highest summits are clothed in Southern Appalachian spruce-fir forest, a habitat that survives in islands above 5,500 feet and that resembles the boreal forests of Canada more than anything else in the South. Lower down, oak-hickory forest dominates, mixed with hemlock and pine. Black bears, bobcats, coyotes, river otters, white-tailed deer, wild boar, wild turkey. The Ocoee salamander is one of dozens of endemic amphibians; this region is among the most salamander-diverse on Earth. A surprising number of the fish species in Blue Ridge streams exist nowhere else.

The largest city in the Blue Ridge is Roanoke, Virginia. The largest metropolitan area is Greenville, South Carolina, in the Upstate. Asheville, North Carolina, sits in a bowl between the Great Smokies and the Blacks; Charlottesville rests against the eastern face in Virginia; Johnson City anchors the Tennessee side. Each of them grew because of a gap in the mountains - a place where a railroad could push through, where a road could be cut, where water could turn a mill. The Blue Ridge has always been a barrier and an invitation at once. John Denver wrote a song about it that became more or less an anthem; Ted Olson wrote a book called *Blue Ridge Folklife* that catalogs what an entire culture made of living on these slopes. The mountains shaped what could grow here, who could come here, and how a place feels when the haze rises in the late afternoon and turns everything that color the Cherokee named first.