Farther to the south the scene shows a change, for the Atlantic plain widens considerably. The Potomac River, the James, the Pedee, and the Savannah flow through valleys much longer than those of the northern rivers. Here in the South commerce was carried on mainly by shallop and pinnace. The trails of the Indian skirted the rivers and offered for trader and explorer passageway to the West, especially to the towns of the Cherokees in the southern Alleghanies or Unakas; but the waterways and the roads over which the hogsheads of tobacco were rolled (hence called "rolling roads") sufficed for the needs of the thin fringes of population settled along the rivers. Trails from Winchester in Virginia and Frederick in Maryland focused on Cumberland at the head of the Potomac. Beyond, to the west, the finger tips of the Potomac interlocked closely with the Monongahela and Youghiogheny, and through this network of mountain and river valley, by the "Shades of Death" and Great Meadows, coiled Nemacolin's Path to the Ohio. Even today this ancient route is in part followed by the Baltimore and Ohio and the Western Maryland Railway. A bird's-eye view of the southern Alleghanies shows that, while the Atlantic plain of Virginia and the Carolinas widens out, the mountain chains increase in number, fold on fold, from the Blue Ridge to the ragged ranges of the Cumberlands. Few trails led across this manifold barrier. There was a connection at Balcony Falls between the James River and the Great Kanawha; but as a trade route it was of no such value to the men of its day as the Chesapeake and Ohio system over the same course is to us. As in the North, so in the South, trade avoided obstacles by taking a roundabout, and often the longest route. In order to double the extremity of the Unakas, for instance, the trails reached down by the Valley of Virginia and New River to the uplands of the Tennessee, and here, near Elizabethton, they met the trails leading up the Broad and the Yadkin rivers from Charleston, South Carolina. To the west rise the somber heights of Cumberland Gap. Through this portal ran the famous "Warrior's Path," known to wandering hunters, the "trail of iron" from Fort Watauga and Fort Chiswell, which Daniel Boone widened for the settlers of Kentucky. To the southwest lay the Blue Grass region of Tennessee with its various trails converging on Nashville from almost every direction. Today the Southern Railway enters the "Sapphire Country," in which Asheville lies, by practically the same route as the old Rutherfordton Trail which was used for generations by red man and pioneer from the Carolina coast.