Question: What county shares a border with another county, where the community of Werth, West Virginia is located?

full_context: Document 1: Nallen, West Virginia: Nallen is an unincorporated community in Fayette and Nicholas counties, West Virginia, United States. Nallen is located along West Virginia Route 41 south of Summersville. Nallen has a post office with ZIP code 26680.
Document 2: Guyandotte River: The Guyandotte River is a tributary of the Ohio River, approximately 166 mi (267 km) long, in southwestern West Virginia in the United States. It was named after the French term for the Wendat Native Americans. It drains an area of the unglaciated Allegheny Plateau south of the Ohio between the watersheds of the Kanawha River to the northeast and Twelvepole Creek and the Big Sandy River to the southwest. Via the Ohio River, it is part of the Mississippi River watershed.
Document 3: Green Valley, Nicholas County, West Virginia: Green Valley is an unincorporated community in Nicholas County, West Virginia, United States. Green Valley is located along West Virginia Route 20 north of Quinwood.
Document 4: Gallatin River: The Gallatin River is a tributary of the Missouri River, approximately 120 mi (193 km long), in the U.S. states of Wyoming and Montana. It is one of three rivers, along with the Jefferson and Madison, that converge near Three Forks, Montana, to form the Missouri.
Document 5: Meadow Creek, West Virginia: Meadow Creek is an unincorporated community in Summers County, West Virginia, United States. Meadow Creek is located on the New River, southwest of Meadow Bridge and north of Hinton.
Document 6: Cheat River: The Cheat River is a tributary of the Monongahela River in eastern West Virginia and southwestern Pennsylvania in the United States. Via the Ohio River, the Cheat and Monongahela are part of the Mississippi River watershed. Owing to the ruggedness of the surrounding Allegheny Mountains, the Cheat remains largely remote with few settlements or developments along its banks. Its headwaters are in the Cheat-Potomac Ranger District of the Monongahela National Forest.
Document 7: Meadow River: The Meadow River is a tributary of the Gauley River, making its headwaters in Greenbrier County and terminating in Nicholas County of West Virginia. It is named for the grassy meadows wetlands which its upper watershed drains, and from which it springs.
Document 8: Donald, West Virginia: Donald is an unincorporated community in Nicholas County, West Virginia, United States. Donald is located by Richwood Municipal Airport east of Summersville.
Document 9: Pool, West Virginia: Pool is an unincorporated community in southwestern Nicholas County, West Virginia, United States. It lies along CR 41-7 just east of Route 41, south of the town of Summersville, the county seat of Nicholas County. Its elevation is 2,142 feet (653 m). Although Pool is unincorporated, it has a ZIP code of 26684; it once had its own post office, which opened on March 31, 1881, and closed on March 19, 2011. The community took its name from standing pool of water near the original town site.
Document 10: Meadow, Utah: Meadow is a town in Millard County, Utah, United States. The population was 254 at the 2000 census. Originally called Meadow Creek, the town is located about eight miles south of Fillmore.
Document 11: South Branch Wildlife Management Area: The South Branch Wildlife Management Area is of mixed oak-hickory woodlands and pastures in Hampshire and Hardy Counties, West Virginia, USA. The South Branch WMA consists of four separate tracts (McNeill, Bridge, Trough Club, and Sector) along the South Branch Potomac River around and south of the river gorge known as The Trough. It is known throughout the region for its dove, squirrel, deer, and wild turkey hunting. The WMA is owned by the West Virginia Division of Natural Resources.
Document 12: Poe, West Virginia: Poe is an unincorporated community in Nicholas County, West Virginia, United States. Poe is located on West Virginia Route 129 southwest of Summersville.
Document 13: Fenwick, West Virginia: Fenwick is a census-designated place (CDP) in eastern Nicholas County, West Virginia, United States, adjacent to and immediately west of Richwood. As of the 2010 census, its population was 116. The town is situated at the bottomland surrounding the mouth of the Big Laurel Creek at its confluence with the Cherry River and has an elevation of 649 m (2129 ft). Fenwick is also the location of the convergence of three state highways: WV 55, WV 39, and WV 20 and acts as the western terminus of the Highland Scenic Highway.
Document 14: Mehi River: Mehi River, a watercourse that is part of the Barwon catchment within the Murray–Darling basin, is located in the Orana district of New South Wales, Australia.
Document 15: Werth, West Virginia: Werth is an unincorporated community in Nicholas County, West Virginia, United States. Werth is located on West Virginia Route 55 northeast of Summersville.
ground_truth: Greenbrier County
sub_queries: Werth, West Virginia >> located in the administrative territorial entity Answer: Nicholas County
Nicholas County >> shares border with Answer: Greenbrier County