The Appalachian Trail traverses the southern spruce-fir forests in the Great Smokies and atop Roan Mountain and Mount Rogers. Other major trails in the southern spruce-fir zone include the Deep Gap Trail in the Black Mountains and the Balsam Mountain Trail and Boulevard Trail in the Great Smokies. Smaller trails (part of the Blue Ridge Parkway corridor) access the summits of Waterrock Knob in the Plott Balsams and Richland Balsam in the Great Balsams.