Question: What county does the county where Pool, West Virginia share a border with?

full_context: Document 1: Shoals, West Virginia: Shoals is an unincorporated community in Wayne County, West Virginia, United States. Shoals is located on West Virginia Route 75 south-southwest of downtown Huntington. Shoals has a post office with ZIP code 25562.
Document 2: Cottageville, West Virginia: Cottageville (also Moores Mill, Rhodess Mill, or Wrights Mill) is an unincorporated community in western Jackson County, West Virginia, United States. It lies along West Virginia Route 331 northwest of the city of Ripley, the county seat of Jackson County. Established in 1858, its elevation is 594 feet (181 m). Although Cottageville is unincorporated, it has a post office, with the ZIP code of 25239. It also is the site of the annual Jackson County Junior Fair. Michael Coleman, a well known early Indian fighter, was killed and buried in the area, according to a historical marker placed by the state of WV. The wooden Grist Mill located here since the 1840s burned to the ground in the summer of 1965. Its foundation stones remain. It had remained in operation full-time until 1930, part-time until 1937. Cottageville was a commercial center with a bank, newspaper, tannery, blacksmith, several stores, a railroad station on the B & O and many other businesses in the early part of the twentieth century. Its heyday faded with the closing of the mill and the improvement of roads in the county. The B & O pulled up its tracks to the county seat, Ripley, in the mid-nineteen-sixties. Less than a mile from the old town, the county operated what folks called the "poor farm," an early version of a welfare commune. That closed in the thirties with the New Deal. That land is now the Jackson County Junior Fairgrounds.
Document 3: 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 4: 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 5: 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 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: 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 8: 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 9: Summersville Lake: Summersville Lake is a reservoir located in the US state of West Virginia. The lake is formed by a rock - fill dam (Summersville Dam) on the Gauley River, south of Summersville in Nicholas County. It is the largest lake in West Virginia, with 2,700 acres (1,100 ha) of water and over 60 miles (97 km) of shoreline at the summer pool water level. Its maximum depth is 327 feet.
Document 10: 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 11: 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 12: 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 13: 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 14: 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 15: North Spring, West Virginia: North Spring is an unincorporated community in Wyoming County, West Virginia, United States. It is located on Route 52/1 which is known as Little Cub Creek Road. It also is home to one of the oldest buildings in West Virginia, a one-room church that sits on the hill at the confluence of Trace Fork Creek and Little Cub Creek. It is also home to the oldest post office in the state, although it has been closed since the flood of 2009. In the 2010 Census, North Spring has a total of 339 residents.
ground_truth: Greenbrier County
sub_queries: Pool, West Virginia >> located in the administrative territorial entity Answer: Nicholas County
Nicholas County >> shares border with Answer: Greenbrier County