Greenbrier River Trail Section is a premier hiking destination in Pocahontas County, West Virginia, covering 12.0 miles with 200ft of elevation gain. Stats: 12.0 miles, 200ft gain, Easy. Type: Point-to-Point. Surface: Gravel. Time: 5-6 hours. Fee: Free. Dogs: Yes. Permit: No. Wildlife: white-tailed deer, black bears, herons, river otters, bald eagles, mink. Best seasons: Spring for wildflowers along the river; fall for foliage; excellent birding year-round. The Greenbrier River Trail follows 78 miles of converted rail corridor along the pristine Greenbrier River. This central section passes through the heart of the Allegheny Highlands in one of WV's most scenic river valleys. Pack plenty of water and layers. Mountain weather in the southern Appalachians can change rapidly — always check the forecast. Leave No Trace: stay on trail, pack out all waste, respect wildlife.