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Marine City is a city in St. Clair County in the U.S. state of Michigan. Located on the west bank of the St. Clair River, it is one of the cities in the River District north of Detroit and south of Lake Huron. In the late 19th century, it was a major center of wooden shipbuilding and lumber processing. The population was 4,079 at the 2020 census. The city formerly featured an international auto ferry service, The Bluewater Ferry to Sombra, Ontario, Canada across the river.

The Marine City City Hall is a former government building located at 300 Broadway Street in Marine City, Michigan. It was listed on the National Register of Historic Places in 1982. City government offices moved out of the building in 2005.

The Marine City Water Works is a public works building located at 229 South Main Street in Marine City, Michigan. It was listed on the National Register of Historic Places in 2011.

Cardinal Mooney Catholic High School is a private, Catholic high school in Marine City, Michigan. It is located in the Roman Catholic Archdiocese of Detroit.

The Ward-Holland House is a private house located at 433 North Main Street in Marine City, Michigan. It was listed on the National Register of Historic Places in 1972.

The Belle River is a 73.5-mile-long (118.3 km) river in the U.S. state of Michigan, flowing into the St. Clair River in Marine City at 42°42′25″N 82°29′50″W. The North Branch Belle River rises out of Long Lake at 43°00′50″N 83°08′41″W in section 22 of Attica Township in southeast Lapeer County. Long Lake is fed by the Long Lake Drain, which drains marshy areas to the south of the lake. From Long Lake, the river flows eastward around the north side of Imlay City. It is fed by the Hunt, Pennell, and Clark Corner drains on the northeast of Imlay City and turns southward, where it joins the main branch of the river at 42°59′31″N 83°03′57″W, now near the intersection of Interstate 69 and M-53. The main branch of the Belle River rises in the south of Dryden Township at 42°53′54″N 83°07′50″W, in a marshy area near the boundary between Lapeer and Oakland counties. It flows mostly north and east until joined by the north branch, after which it flows mostly south and east into St. Clair County. It passes the north side of Memphis, then turns southeast and passes through the northeast corner of Macomb County. Interstate 94 crosses the river in the northeast corner of Casco Township. The river continues east by southeast through China Township and into East China Township, where it turns south less than a half mile from the St. Clair River and parallels the St. Clair for a few miles before its mouth in downtown Marine City. The river's watershed drains portions of Lapeer, Macomb, Oakland, and St. Clair counties.

Cottrellville Township is a civil township of St. Clair County in the U.S. state of Michigan. The population was 3,406 at the 2020 Census.

Sombra is a village situated on the St. Clair River, in southwestern Ontario, Canada within the municipality of St. Clair Township. In its early days, the village developed out of local transport and agricultural trade via rail and ship and evolved mainly into a summer resort community, serving seasonal residences and summer cottagers through much of its history. The village is now home to mostly permanent residences and commuters supported by larger cities and towns such as Sarnia, Corunna, and Wallaceburg. Each year, in July, the town hosts Sombra Days. This community is served by two elementary schools, several churches and a small service industry. The public school is Riverview Central School. In the recent past, Sombra served as a registered port of entry into Canada by means of a ferry crossing, the Bluewater Ferry from nearby Marine City, Michigan, United States.

The Sombra – Marine City (Bluewater) Ferry was a ferry service that crossed the St. Clair River, connecting Sombra, Ontario in Canada on the eastern bank with Marine City, Michigan in the United States on the western bank. Vehicles accessed the ferry from Lambton County Road 33/St. Clair Parkway (a former alignment of Highway 40) in Sombra or from Highway M-29 in Marine City. In Sombra on the Ontario/Canadian side, the dock was on King Street. On the Michigan/American side, the dock was on South Water Street. In July, 2013 the ferry was charging a toll of $7.00 (CAN or US) for an automobile. The first departure from Sombra was 6:40 AM, and from Marine City was 7:00 AM.

Fawn Island is a small Canadian island located in the St. Clair River between Sombra, Ontario and Marine City, Michigan. The island is approximately 50 miles (80 km) northeast of Detroit, Michigan and Windsor, Ontario. There are over 50 cottages on the island, all accessible via the island's two canals. The canals divide the island into three islets, joined by two small bridges.

Belle River Power Plant is a major coal-and-natural gas-fired power plant owned by Detroit Edison, a subsidiary of DTE Energy. It is located in St. Clair County, Michigan, on the peninsula formed by the St. Clair and Belle rivers. The plant was built across M-29 from the St. Clair Power Plant in East China, Michigan, and shares the coal delivery terminal with it. The Belle River plant also shares cooling water from the St. Clair River with its sister plant. Five oil-fueled internal combustion generators (named IC1, IC2, 3, 4, and 5) were built in 1981, with a total output 13.75 megawatts. Coal-fired unit 1 of the Belle River plant was completed in 1984, followed by a similar unit 2 in 1985. Each unit has a nameplate capacity of 697.5 MWe, however the coal-fired plant as a whole generates 1260 MWe all year around. In 1999, three peaker natural-gas fired turbines (named 12-1, 12-2, and 13-1) were added, with a total name-plate capacity of 256 MWe. Belle River is Detroit Edison's third largest producer of electricity. The power plant has a significant impact on the local economy, employing many residents. The Lansing Board of Water and Light owns a small portion of the power plant and buys electricity from DTE during peak demand periods. The plant will be fully converted to natural gas by 2026.

China Township is a charter township of St. Clair County in the U.S. state of Michigan. The population was 3,551 at the 2010 Census. It is named after China, Maine.