Question: Which state of Canada is connected to the most populous city in the US state of Michigan and the seat of Wayne County, by means of the Michigan Central Railway Tunnel, a railroad tunnel under the Detroit River?

full_context: Document 1: Detroit: Detroit ( ) is the most populous city in the U.S. state of Michigan, the largest city on the United States–Canada border, and the seat of Wayne County. The municipality of Detroit had a 2015 estimated population of 677,116, making it the 21st-most populous city in the United States. The metropolitan area, known as Metro Detroit, is home to 4.3 million people, making it the second-largest in the Midwest after Chicago.
Document 2: Maine Central Railroad main line: The Maine Central Railroad Company main line extended from Portland, Maine, east to the Canada–US border with New Brunswick at the Saint Croix-Vanceboro Railway Bridge. It is the transportation artery linking Maine cities to the national railway network. Sections of the main line had been built by predecessor railroads consolidated as the Maine Central in 1862 and extended to the Canada–US border in 1882. Through the early 20th century, the main line was double track from South Portland to Royal Junction, where it split into a lower road through Brunswick and Augusta and a back road through Lewiston which converged at Waterville into single track to Bangor and points east. Westbound trains typically used the lower road with lighter grades, while eastbound trains of empty cars used the back road. This historical description does not include changes following purchase of the Maine Central Railroad by Guilford Transportation Industries in 1981 and subsequent operation as part of Pan Am Railways.
Document 3: Wayne County, Michigan: Wayne County is the most populous county in the U.S. state of Michigan. As of the 2016 census, its population was 1,749,366 making it the 19th-most populous county in the United States. The 2014 Census update listed the county's population at 2,264,804. The county seat is Detroit, the most populous city in Michigan and 18th-most populous city in the United States. The county was founded in 1796 and organized in 1815.
Document 4: First Street Tunnel: The First Street Tunnel is a two-track, soft-earth tunnel built between 1904 and 1906 by the Washington Terminal Company to serve as the southern approach to Union Station in Washington, D.C. Currently owned by Amtrak, it connects to lower-level tracks and platforms at the station, passes under Capitol Hill and connects to the RF&P Subdivision (CSX Transportation) and Long Bridge, offering through railway service to Alexandria, Virginia, and points west and south. Unlike the Northeast Corridor tracks north of Union Station, the tunnel tracks are not electrified, so southbound trains leaving Union Station must switch to diesel locomotives before entering the tunnel. Exiting Union Station, the tunnel runs due south under First Street NE and SE before curving to the southwest under a parking lot near the Capitol South Metro station. Its southern portal is just east of South Capitol Street at the intersection of D Street SE and New Jersey Avenue SE.
Document 5: Warren, Michigan: Warren is a city in Macomb County in the U.S. state of Michigan. The 2010 census places the city's population at 134,056, making Warren the largest city in Macomb County, the third largest city in Michigan, and Metro Detroit's largest suburb.
Document 6: Milwaukee: Milwaukee ( , ) is the largest city in the state of Wisconsin and the fifth-largest city in the Midwestern United States. The county seat of Milwaukee County, it is on Lake Michigan's western shore. Ranked by estimated 2014 population, Milwaukee was the 31st largest city in the United States. The city's estimated population in 2015 was 600,155. Milwaukee is the main cultural and economic center of the Milwaukee metropolitan area. It is also part of the larger Milwaukee-Racine-Waukesha combined statistical area, which had an estimated population of 2,026,243 in the 2010 census.
Document 7: Port of Detroit: The Port of Detroit is located along the west side of the Detroit River, and is the largest seaport in the state of Michigan. The port is overseen by the Detroit/Wayne County Port Authority, a five-member board of directors appointed by the State of Michigan, Wayne County, and the City of Detroit. The authority coordinates river commerce on the waters and shoreline of Wayne County. The port consists of multiple marine terminals handling general, liquid, and bulk cargo as well as passengers. The Port of Detroit's single most valuable commodity is steel, and the largest commodity handled by tonnage is ore. Other important commodities handled at the port include stone, coal and cement.
Document 8: Detroit–Windsor: The Detroit–Windsor region is an international transborder agglomeration comprising the American city of Detroit, Michigan, the Canadian city of Windsor, Ontario, and the Detroit River between them. The Detroit–Windsor area acts as a critical commercial link straddling the Canada–United States border and has a total population of about 5,700,000. It is North America's largest cross-border conurbation.
Document 9: Lansing, Michigan: Lansing is the capital of the US state of Michigan. It is mostly in Ingham County, although portions of the city extend west into Eaton County and north into Clinton County. The 2010 Census placed the city's population at 114,297, making it the fifth largest city in Michigan. The population of its Metropolitan Statistical Area (MSA) was 464,036, while the even larger Combined Statistical Area (CSA) population, which includes Shiawassee County, was 534,684. It was named the new state capital of Michigan in 1847, ten years after Michigan became a state.
Document 10: Joe Louis Arena station: Joe Louis Arena station is a Detroit People Mover station in Downtown Detroit, Michigan. It is located inside the Joe Louis Arena, home of the NHL's Red Wings, near the intersection of 3rd Street and Jefferson Avenue where M-10 terminates. It also serves the Riverfront Promenade, the Wayne County Community College Downtown Detroit campus and provides a direct connection for residents of the Riverfront Apartments.
Document 11: Greektown station: Greektown station is a Detroit People Mover station in Downtown Detroit, Michigan. It is located above Beaubien Street with an elevated walkway providing direct connection to the Greektown Casino on the 3rd level (in the 500 block of East Lafayette Street), which was previously the Trappers Alley indoor shopping center. The station takes its name from the Historic Greektown district.
Document 12: List of islands in the Detroit River: The following is a description of islands in the Detroit River. The Detroit River is a river in the Great Lakes system, about 32 miles (51 km) long and 0.5–2.5 miles (0.8–4.0 km) wide. The river serves as a major shipping channel, jointly controlled by the United States and Canada, and is a major component of the Canada–United States border. Ownership and control of the islands varies by their geographic location along the river. The majority of islands are on the American side of the river, which are all under the jurisdiction of Wayne County in Michigan. The Canadian islands are part of Essex County in Ontario. There are no islands in the Detroit River that are divided by the international border.
Document 13: Detroit River: The Detroit River flows for 24 nmi from Lake St. Clair to Lake Erie as a strait in the Great Lakes system and forms part of the border between Canada and the United States. The river divides the metropolitan areas of Detroit, Michigan and Windsor, Ontario - an area referred to as Detroit–Windsor. The two cities are connected by the Ambassador Bridge, the Detroit–Windsor Tunnel and the Michigan Central Railway Tunnel.
Document 14: Michigan Central Railway Tunnel: The Michigan Central Railway Tunnel is a railroad tunnel under the Detroit River connecting Detroit, Michigan, in the United States with Windsor, Ontario, in Canada. The US entrance is south of Porter and Vermont streets near Rosa Parks Boulevard. The Canadian entrance is south of Wyandotte Street West between Cameron and Wellington Avenues. It was built by the Detroit River Tunnel Company for the Canada Southern Railway, leased by the Michigan Central Railroad and owned by the New York Central Railroad. The tunnel opened in 1910 and is still in use today by the Canadian Pacific Railway. On the Detroit side, the area around the tunnel is off limits to the general public and is routinely patrolled by officers and agents of the US Department of Homeland Security, Canadian Pacific Police Service, CN Police, Detroit Police Department, and the security elements of the bridge company.
Document 15: Ann Arbor, Michigan: Ann Arbor is a city in the U.S. state of Michigan and the county seat of Washtenaw County. The 2010 census recorded its population to be 113,934, making it the sixth largest city in Michigan.
ground_truth: Ontario