Question: What county was founded in 1796 and organized in 1815, has a city known for its waterfront and growing boating community?

full_context: Document 1: Plymouth, Michigan: Plymouth is a city in Wayne County in the U.S. state of Michigan. The population was 9,132 at the 2010 census. The City of Plymouth is landlocked, being entirely surrounded by the Charter Township of Plymouth.
Document 2: 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 3: 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 4: Trenton, Michigan: Trenton is a small city in Wayne County in the southeast portion of the U.S. state of Michigan. At the 2010 census, the city population was 18,853. The city is part of Downriver, a collection of mostly blue-collar communities south of Detroit on the west bank of the Detroit River. Trenton is known for its waterfront and growing boating community. It is also known as being one of the more affluent Downriver communities.
Document 5: Inkster, Michigan: Inkster is a city in Wayne County, Michigan, United States. At the 2010 census, the city population was 25,369. It is one of the few Metro Detroit suburbs whose population is majority African American.
Document 6: 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.
Document 7: Troy, Michigan: Troy is a city located in Metropolitan Detroit's northern suburbs in Oakland County in the U.S. state of Michigan. The population was 80,980 at the 2010 census, making it the 11th-largest city in Michigan by population, and the largest city in Oakland County. Troy has become a business and shopping destination in the Metro Detroit area, with numerous office centers and the upscale Somerset Collection mall.
Document 8: 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 9: Grand Rapids, Michigan: Grand Rapids is the second-largest city in Michigan, and the largest city in West Michigan. It is on the Grand River about 30 mi east of Lake Michigan. As of the 2010 census, the city population was 188,040. In 2010, the Grand Rapids metropolitan area had a population of 1,005,648, and the combined statistical area of Grand Rapids-Muskegon-Holland had a population of 1,321,557. Grand Rapids is the county seat of Kent County.
Document 10: 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 11: Fort Wayne, Indiana: Fort Wayne is a city in the U.S. state of Indiana and the seat of Allen County. Located in northeastern Indiana, the city is 18 mi west of the Ohio border and 50 mi south of the Michigan border. With an estimated population of 264,488 in 2016, Fort Wayne is the 77th most populous city in the United States and the second largest in Indiana, after Indianapolis. It is the principal city of the Fort Wayne metropolitan area, consisting of Allen, Wells, and Whitley counties, a combined population of 419,453 as of 2011. In addition to the three core counties, the combined statistical area (CSA) includes Adams, DeKalb, Huntington, Noble, and Steuben counties, with an estimated population of 615,077.
Document 12: Wayne State University: Wayne State University (WSU) is a public research university located in Detroit, Michigan. Founded in 1868, WSU consists of 13 schools and colleges offering nearly 350 programs to more than 27,000 graduate and undergraduate students. Wayne State University is Michigan's third-largest university and one of the 100 largest universities in the United States.
Document 13: 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 14: 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 15: Saginaw County, Michigan: Saginaw County, officially the County of Saginaw, is a county located in the U.S. state of Michigan. As of the 2010 census, the population was 200,169. The county seat is Saginaw. The county was created by September 10, 1822, and was fully organized on February 9, 1835. The etymology of the county's name is uncertain. It may be derived from "Sace-nong" or "Sak-e-nong" (English: Sauk land ), as the Sauk (French: "Sac" ) tribe once lived there. Another possibility is that it comes from Ojibwe words meaning "place of the outlet" –"sag" (English: an opening ) and "ong" (English: place of ). "See" List of Michigan county name etymologies.
ground_truth: Wayne County