Question: Beaver County is a county located in the U.S. state of Oklahoma, it is located in the Oklahoma Panhandle, the extreme northwestern region of the state of Oklahoma, in which country?

Context articles: Beaver Dunes Park
Black Mesa (Oklahoma)
Beaver, Oklahoma
Beaver County, Pennsylvania
Beaver River (Oklahoma)
Oklahoma Panhandle
Northwestern Oklahoma
Beaver Dam, Arizona
U.S. Route 64 in Oklahoma
Beaver County, Oklahoma

Beaver Dunes Park is in Beaver County, Oklahoma, near the city of Beaver.
 The 520 acre park, located in the panhandle region of Oklahoma, offers dune buggy riding on 300 acre of sand hills, fishing, hiking trails, a playground and two campgrounds.
 Hackberry Bend Campground is located next to Beaver Lake, approximately 2 acre , stocked with largemouth bass, channel catfish, and perch, and has 7 RV sites and 10 tent sites.
 Also located in Hackberry Bend is a one-room primitive cabin which sleeps four and can be reserved.
 Pioneer Campground is located adjacent to the ORV area.
 This campground has 13 RV sites with direct access to the dunes.
 Both campgrounds have a comfort station with hot showers.
 Dump station located at Hackberry Bend Campground.
 Both campgrounds have handicap accessibility.
 Another area of the park is Big Sandy picnic area.
 This area has a sand volleyball court, basketball goal, horseshoe pits, playground, nature trail, and two reservable shelters.
Black Mesa is a mesa in the U.S. states of Colorado, New Mexico, and Oklahoma.
 It extends from Mesa de Maya, Colorado southeasterly 28 mi along the north bank of the Cimarron River, crossing the northeast corner of New Mexico to end at the confluence of the Cimarron River and Carrizo Creek near Kenton in the Oklahoma panhandle.
 Its highest elevation is 5705 ft in Colorado.
 The highest point of Black Mesa within New Mexico is 5239 ft .
 In northwestern Cimarron County, Oklahoma, Black Mesa reaches 4973 ft , the highest point in the state of Oklahoma.
 The plateau that formed at the top of the mesa has been known as a "geological wonder" of North America.
 There is abundant wildlife in this shortgrass prairie environment, including mountain lions, butterflies, and the Texas horned lizard.
Beaver is a town and county seat in Beaver County, Oklahoma, United States.
 The community is located in the Oklahoma Panhandle.
 As of the 2010 census, the town population was 1,515, a 3.5 percent decrease from 1,570 at the 2000 census.
Beaver County is a county located in the U.S. state of Pennsylvania.
 As of the 2010 census, the population was 170,539.
 Its county seat is Beaver.
 The county was created on March 12, 1800, from parts of Allegheny and Washington Counties.
 It took its name from the Beaver River.
The Beaver River is the historic name for an intermittent river in Oklahoma that drains most of the Oklahoma Panhandle.
 It is also known as the North Canadian River; both names are in common use.
 The Beaver River flows from Union County, New Mexico, entering the Oklahoma Panhandle in Cimarron County, then flowing out of state through Sherman County in the Texas Panhandle for about 15 mi , then back to the Oklahoma panhandle in Texas County, where it is impounded in Optima Lake near Guymon.
 Downstream of the dam, it continues through the Oklahoma counties of Beaver and Harper before ending in Woodward County.
The Oklahoma Panhandle is the extreme northwestern region of the state of Oklahoma, consisting of Cimarron County, Texas County, and Beaver County, from west to east.
 As with other salients in the United States, its name comes from the similarity of its shape to the handle of a cooking pan.
Northwestern Oklahoma is the geographical region of the state of Oklahoma which includes the Oklahoma Panhandle and a majority of the Cherokee Outlet, stretching to an eastern extent along Interstate 35, and its southern extent along the Canadian River to Noble County.
 Northwest Oklahoma is also known by its Oklahoma Department of Tourism designation, Red Carpet Country, which is named after the region's red soil and alludes to the metaphor that the panhandle is a "red carpet" into Oklahoma.
 The region consists of Cimarron, Texas, Beaver, Harper, Woods, Alfalfa, Grant, Kay, Ellis, Woodward, Major, Garfield, Noble, Dewey, Blaine, Kingfisher counties.
Beaver Dam is an unincorporated community in Mohave County located in the extreme northwestern corner of the U.S. state of Arizona, settled in 1863.
 It is located along Interstate 15 approximately 10 miles northeast of Mesquite, Nevada.
 Beaver Dam is located in the 86432 zip code, which had a population of 1,053 as of the 2000 census.
U.S. Route 64 (US-64) is a U.S. highway running from the Four Corners area to the Outer Banks of North Carolina.
 Between these two points, the highway passes through the entire width of Oklahoma; a total of 591.17 mi of US-64 lies in the state of Oklahoma.
 US-64 enters the state from New Mexico, crossing the line between the two states between Clayton, New Mexico, and Boise City in Cimarron County.
 The route runs the full length of the Oklahoma Panhandle, then serves the northernmost tier of counties in the main body of the state before dipping southeastward to Tulsa, the state's second-largest city.
 From Tulsa, the highway continues southeast, leaving Oklahoma just west of Fort Smith, Arkansas.
 In addition to Tulsa, US-64 serves fifteen Oklahoma counties and the cities of Guymon, Woodward, Enid, and Muskogee.
Beaver County is a county located in the U.S. state of Oklahoma.
 As of the 2010 census, the population was 5,636.
 The county seat is Beaver.
 The name was given because of the presence of many beaver dams on the Beaver River, which runs through the area.
 It is located in the Oklahoma Panhandle.