Question: What county is The Northland Arboretum located in?

full_context: Document 1: Bloomington, Minnesota: Bloomington is the fourth largest city in the U.S. state of Minnesota. It is located in Hennepin County on the north bank of the Minnesota River, above its confluence with the Mississippi River. Bloomington lies 10 mi south of downtown Minneapolis. As of the 2010 census the city's population was 82,893, and in 2016 the estimated population was 85,319.
Document 2: Burlington Northern (Brainerd/Baxter): The 70-acre Burlington Northern (Brainerd/Baxter Plant) is a United States Environmental Protection Agency (EPA) Superfund site located on the boundary between the cities of Brainerd and Baxter, in Crow Wing County, Minnesota, in an area south of the Paul Bunyan State Trail and State Highway 210 and north of Florence Street. The Mississippi River flows approximately 3,000 feet east of the site. The site is bordered by commercial and light industrial areas to the north and southwest and by residential areas to the south and southeast.
Document 3: Brainerd, Minnesota: Brainerd is a city in Crow Wing County, Minnesota, United States. Its population was 13,592 as of the 2010 census. It is the county seat of Crow Wing County, and is one of the largest cities in Central Minnesota. Brainerd straddles the Mississippi River several miles upstream from its confluence with the Crow Wing River, having been founded as a site for a railroad crossing above said confluence. Brainerd is the principal city of the Brainerd Micropolitan Area, a micropolitan area covering Cass and Crow Wing counties and with a combined population of 91,067 as of the 2010 census. The Brainerd area serves as a major tourist destination for Minnesota, and Baxter is a regional retail center.
Document 4: Ladd Arboretum: The Edward R. Ladd Arboretum is an arboretum located at 2024 McCormick Boulevard, Evanston, Illinois, occupying 23 acres (93,000 m²) in a narrow three-quarter mile (1.2 km) stretch between McCormick Boulevard and the North Shore Channel on land leased from the Metropolitan Water Reclamation District of Greater Chicago.
Document 5: Northwest Angle State Forest: The Northwest Angle State Forest is a state forest located in Lake of the Woods County, Minnesota. The name of the forest is derived from its location near the Northwest Angle, the northernmost point of the contiguous United States. The forest borders the Canadian provinces of Manitoba and Ontario, and the Red Lake Indian Reservation. The forest is managed by the Minnesota Department of Natural Resources.
Document 6: Mankato, Minnesota: Mankato ( ) is a city in Blue Earth, Nicollet, and Le Sueur counties in the state of Minnesota. It is the 22nd biggest city in Minnesota. The population was 41,044 according to 2015 US census estimates, making it the fifth largest city in Minnesota outside of the Minneapolis–Saint Paul metropolitan area. The county seat of Blue Earth County, it is located along a large bend of the Minnesota River at its confluence with the Blue Earth River. Mankato is across the Minnesota River from North Mankato. Mankato and North Mankato have a combined population of over 53,000, according to the 2010 census. It completely encompasses the town of Skyline. North of Mankato Regional Airport, a tiny non-contiguous part of the city is located within Le Sueur County. Most of the city of Mankato is located within Blue Earth County.
Document 7: Eden Prairie, Minnesota: Eden Prairie is an edge city 12 mi southwest of downtown Minneapolis in Hennepin County, and the 12th-largest city in the State of Minnesota. It is on the north bank of the Minnesota River, upstream from its confluence with the Mississippi River. Eden Prairie and nearby suburbs form the southwest portion of Minneapolis–Saint Paul, the 15th-largest metropolitan area in the United States, with about 3.6 million residents. Eden Prairie had a population of 60,797 at the 2010 census, which made it the 7th-largest suburb in the Twin Cities and the 12th-largest city in Minnesota.
Document 8: The Arboretum at Flagstaff: The Arboretum at Flagstaff is a 200 acre arboretum that is home to 750 species of mostly drought-tolerant adapted and native plants representative of the high-desert Colorado Plateau, home to the Grand Canyon and Zion National Park. It is located 3.8 mi south of U.S. Route 66 on Woody Mountain Road, on the west side of Flagstaff, Arizona, USA. The facility is located at 7,150' in elevation, making it one of the highest-elevation public gardens in the United States. The Arboretum has an extensive regional collection of the Penstemon genus and hosts an annual Penstemon Festival.
Document 9: Overland Park Arboretum and Botanical Gardens: Overland Park Arboretum and Botanical Gardens (120 hectares / 300 acres) is a relatively new arboretum and botanical garden located a mile west of U.S. Highway 69 on 179th Street, Overland Park, Kansas. It is operated by the City of Overland Park, and championed by head supervisor Karen Kerkhoff.
Document 10: Saint John's Arboretum: Located in Collegeville, Minnesota, Saint John's Arboretum encompasses over 2500 acre settled by Benedictine monks in 1864. Since its founding, the abbey has been guided by the Benedictine principles of stability, hospitality, and stewardship. In 1997, this longstanding principle of stewardship led the monks to designate the lands of Saint John's University as a natural arboretum. Saint John's Arboretum is advantageously located in the unique area of terminal moraines (glacial deposits) that distinguish central Minnesota. The varied terrain and its location between the hardwoods and prairies creates considerable diversity in the habitats found there.
Document 11: Bemidji, Minnesota: Bemidji ( ) is a city in Beltrami County (and county seat), in north west Minnesota, United States. With a population of 14,301 as of July 1, 2016., it is the largest commercial center between Grand Forks, North Dakota and Duluth, Minnesota. Bemidji houses many Native American services, which includes the Indian Health Service. The city is the central hub of the Red Lake Indian Reservation, White Earth Indian Reservation and the Leech Lake Indian Reservation. Bemidji lies on the south west shore of Lake Bemidji, the northernmost lake feeding the Mississippi River and as such is deemed "The First City On The Mississippi." Bemidji is also called the "curling capital" of the U.S.
Document 12: Middletown Nature Gardens: The Middletown Nature Gardens is located off Randolph Road in Middletown, Connecticut. In 1995, the city of Middletown, CT purchased the 18 acre of land and dedicated it open space. This piece of land serves as a natural habitat to many plants and animals. There are many trails to walk about surrounded by an array of diverse trees and shrubs. Some of the types of trees and shrubs include red cedar, flowering dogwood, highbush blueberries, white pine, and speckled alder. The main trail is a 0.5 mi loop. Mulched side trails, which branch off the main trail, add another 0.5 mi to walk. Community volunteers maintain the park. They have erected many bluebird boxes and bat houses to house some of the natural wildlife of the park. There are also vernal pools, which are habitats for salamanders and wood frogs in the southeast corner of the park. There is even a 200-year-old sugar maple, which is called the “bee tree,” in which a large colony of bees has made it their home.
Document 13: Brainerd Lakes Regional Airport: Brainerd Lakes Regional Airport (IATA: BRD, ICAO: KBRD, FAA LID: BRD) is a public use airport located three nautical miles (6 km) northeast of the central business district of Brainerd, a city in Crow Wing County, Minnesota, United States. The airport is owned by the city and county. It is mostly used for general aviation but is also served by one commercial airline.
Document 14: Paul Bunyan Land: Paul Bunyan Land is an amusement park located in Brainerd, Minnesota, on This Old Farm. Its trademark is the 26 ft animated and talking statue of Paul Bunyan. As children enter, Paul welcomes them by name. The amusement park has 27 rides for children and is surrounded by 30 buildings.
Document 15: Northland Arboretum: The Northland Arboretum is a 583-acre non-profit arboretum and nature reserve in Brainerd, Minnesota, United States.
ground_truth: Crow Wing County