Park about a mile south of the TN / KY border on Divide Rd. Take your pick, clockwise or counter-clockwise direction. There are a couple of miles of gravel either at the beginning or end of the ride. Look for the Chestnut Ridge trailhead sign.
Take special care crossing the wooden bridges. They can be treacherously slick when wet. The trail, however, holds up well in wet weather.
This can be made into an epic ride by descending the cliff face into No Business Creek. That option is recommended only for experienced backcountry riders.