Do the Appalachian Mountains Touch the Blue Ridge Mountains?

Yes—intimately. The Blue Ridge Mountains are a physiographic province of the larger Appalachian Mountain system, not a separate range that merely "touches" them.

Relationship

• Appalachians: Entire mountain system from Newfoundland to Alabama (~2,000 mi).
• Blue Ridge: Eastern front of the Appalachians, running ~550 mi from southern Pennsylvania through Maryland, Virginia, West Virginia, North Carolina, South Carolina, Tennessee, to northern Georgia.
• Includes: Shenandoah National Park, Great Smoky Mountains (subrange), Mount Mitchell (highest peak east of Mississippi, 6,684 ft), Blue Ridge Parkway.

Geologic Distinction

The Blue Ridge consists of Precambrian crystalline basement rocks (granites, gneisses) thrust westward over younger sedimentary rocks of the Valley and Ridge province. It represents the core of the Appalachian orogen.

So They Don't Just "Touch"

The Blue Ridge is the Appalachians' eastern backbone. Saying they "touch" is like saying your spine "touches" your body—it's an integral part.