The Blue Ridge, or Blue Ridge Mountains, is a physiographic province of the larger Appalachian division. The province consists of the Northern and Southern physiographic sections, which divide near the Roanoke River gap. This a mountain chain in the eastern United States, part of the Appalachian Mountains, forming their eastern front from Georgia to Pennsylvania.

To the west of the Blue Ridge, between it and the bulk of the Appalachians, lies the Great Valley, bordered on the west by the Ridge and Valley province. The mountains are well known for their bluish color when seen from a distance. Trees put the "blue" in Blue Ridge, from the isoprene released into the atmosphere, thereby contributing to the characteristic haze on the mountains and their distinctive color.

Within the Blue Ridge province are two distinct sections: the Shenandoah in the northern section and the Great Smoky Mountains in the southern section. The Blue Ridge also contains the Blue Ridge Parkway, a 469-mile (755 km) long scenic highway that connects the two parks and is located along the ridge crestlines along the Appalachian Trail. Although the term "Blue Ridge" is sometimes applied exclusively to the eastern edge or front range of the Appalachian Mountains, the geological definition of the Blue Ridge province extends westward to the Ridge and Valley area, encompassing the Great Smoky Mountains, the Great Balsams, the Roans, the Brushy Mountains (a "spur" of the Blue Ridge) and other mountain ranges.

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