Marks Knob is the higher of the two peaks that crown Dashoga Ridge (Mount Hardison is the other). Dashoga Ridge descends from its intersection with the Balsam Mountain crest on the slopes of Mount Yonaguska southward to the remote upper Raven Fork Valley. The ridge runs roughly parallel to the main Great Smokies crest, which is just opposite the valley to the west. Marks Knob consists of two peaks, with the southern-most peak being the true summit. The mountain is located entirely within Swain County, North Carolina. Raven Fork, which drains Dashoga Ridge, is part of the Oconaluftee River watershed. The rocks comprising Dashoga Ridge consist mainly of Precambrian metamorphic sandstones of the Ocoee Supergroup.