Defined to the east by Cave Mountain and to the west by North Fork Mountain , Smoke Hole has been part of the Monongahela National Forest 's Spruce Knob - Seneca Rocks National Recreation Area since 1965 .
Some of part is still private land .
Defined to the east by Cave Mountain and to the west by North Fork Mountain , Smoke Hole has been part of the Monongahela National Forest 's Spruce Knob - Seneca Rocks National Recreation Area since 1965 , although some of it is still private land .