Question: In which country is Alta, West Virginia, in the county sharing a border with Birch River's county?

full_context: Document 1: Alta, Greenbrier County, West Virginia: Alta is an unincorporated community in Greenbrier County, West Virginia, United States. Alta is located at the junction of Interstate 64, U.S. Route 60, and West Virginia Route 12 northwest of Lewisburg.
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: 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 4: Boggs, West Virginia: Boggs is an unincorporated community on the Birch River in Webster County, West Virginia, United States. Boggs lies along West Virginia Route 82.
Document 5: West Virginia Route 76: West Virginia Route 76 is an east–west state highway in northern West Virginia. The western terminus of the route is at U.S. Route 50 in the shadow of Bridgeport's Benedum Airport. The eastern terminus is at U.S. Route 119 and U.S. Route 250 three miles (5 km) north of Philippi.
Document 6: Greenbrier Valley Airport: Greenbrier Valley Airport IATA: LWB ICAO: KLWB FAA LID: LWB Summary Airport type Public Owner Greenbrier County Airport Authority Serves Lewisburg, West Virginia Location Greenbrier County, West Virginia, near Lewisburg and White Sulphur Springs Elevation AMSL 2,301 ft / 701 m Coordinates 37 ° 51 ′ 30 ''N 080 ° 23 ′ 58'' W ﻿ / ﻿ 37.85833 ° N 80.39944 ° W ﻿ / 37.85833; - 80.39944 Coordinates: 37 ° 51 ′ 30 ''N 080 ° 23 ′ 58'' W ﻿ / ﻿ 37.85833 ° N 80.39944 ° W ﻿ / 37.85833; - 80.39944 Website www.gvairport.com Map LWB LWB Show map of West Virginia Show map of the US Show all Location of airport in West Virginia / United States Runways Direction Length Surface ft m 4 / 22 7,003 2,135 Asphalt Statistics (2012) Aircraft operations 23,954 Based aircraft 26 Source: Federal Aviation Administration
Document 7: 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 8: North Branch Birch River: The North Branch Birch River is a river in Aroostook County, Maine, in the United States. From the outlet of a small pond () in Maine Township 16, Range 8, WELS, it runs about east and about south to its confluence with the South Branch in the town of Eagle Lake to form the Birch River. It is part of the Fish River watershed, draining north to the Saint John River and ultimately southeast to the Bay of Fundy in New Brunswick, Canada.
Document 9: Alta, Fayette County, West Virginia: Alta is an unincorporated community in Fayette County, West Virginia, United States. Alta is located on West Virginia Route 16 and West Virginia Route 39 north of Gauley Bridge.
Document 10: Valley Bend, Randolph County, West Virginia: Valley Bend is a census-designated place (CDP) in Randolph County, West Virginia, United States. Valley Bend is located on U.S. Route 219, U.S. Route 250, West Virginia Route 55, and West Virginia Route 92 northwest of Mill Creek. Valley Bend has a post office with ZIP code 26293. As of the 2010 census, its population was 485.
Document 11: 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 12: 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 13: Interstate 77 in West Virginia: Interstate 77 Route information Maintained by West Virginia Division of Highways and West Virginia Parkways Authority Length 187.21 mi (301.29 km) Existed November 8, 1954 -- present Major junctions South end I - 77 / US 52 at Virginia state line US 460 near Princeton I ‐ 64 from Beckley to Charleston WV 16 / WV 97 at Beckley US 19 near Beckley US 60 at Charleston I ‐ 79 near Charleston US 33 from Ripley to Ravenswood WV 2 from Ravenswood to Parkersburg US 50 at Parkersburg North end I - 77 at Ohio state line Highway system Interstate Highway System Main Auxiliary Suffixed Business Future West Virginia State Highway System Interstate US State ← WV 76 WV 78 →
Document 14: 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 15: Birch River, West Virginia: Birch River is a census-designated place (CDP) in northern Nicholas County, West Virginia, United States. The community is situated in the valley of the Birch River and is the location of the western terminus of West Virginia Route 82 at U.S. Route 19. As of the 2010 census, its population was 107.
ground_truth: U.S.
sub_queries: Birch River >> located in the administrative territorial entity Answer: Nicholas County
Nicholas County >> shares border with Answer: Greenbrier County
Alta, Greenbrier County , West Virginia >> country Answer: U.S.