Straits of Mackinac in the context of "Mackinac Bridge"

The Great Lakes, also called the Great Lakes of North America, are a series of large interconnected freshwater lakes spanning the Canada–United States border. The five lakes are Superior, Michigan, Huron, Erie, and Ontario (though hydrologically, Michigan and Huron are a single body of water, joined at the Straits of Mackinac). The Great Lakes Waterway enables modern travel and shipping by water among the lakes. The lakes connect ultimately to the Atlantic Ocean via the Saint Lawrence River as their primary drainage outflow. The lakes are also connected to the Mississippi River basin through the Illinois Waterway.

The Great Lakes are the largest group of freshwater lakes on Earth by total area and the second-largest by total volume. They contain 21% of the world's surface fresh water by volume. The total surface is 94,250 square miles (244,106 km), and the total volume (measured at the low water datum) is 5,439 cubic miles (22,671 km), slightly less than the volume of Lake Baikal (5,666 cu mi or 23,615 km, 22–23% of the world's surface fresh water). Because of their sea-like characteristics, such as rolling waves, sustained winds, strong currents, great depths, and distant horizons, the five Great Lakes have long been called inland seas. Depending on how it is measured, by surface area, either Lake Superior or Lake Michigan–Huron is the second-largest lake in the world and the largest freshwater lake. Lake Michigan is the largest lake, by surface area, that is entirely within one country, the United States.

Lake Michigan (/ˈmɪʃɪɡən/ MISH-ig-ən) is one of the five Great Lakes of North America. It is the second-largest of the Great Lakes by volume (1,180 cu mi; 4,900 km) and depth (923 ft; 281 m) after Lake Superior and the third-largest by surface area (22,405 sq mi; 58,030 km), after Lake Superior and Lake Huron. To the east, its basin is conjoined with that of Lake Huron through the wide and deep Straits of Mackinac, giving it the same surface elevation as its eastern counterpart; hydrologically, the two bodies are a single lake that is, by area, the largest freshwater lake in the world.

Lake Michigan is the only Great Lake located fully in the United States; the other four are shared between the U.S. and Canada. It is the world's largest lake, by area, located fully in one country, and is shared, from west to east, by the U.S. states of Wisconsin, Illinois, Indiana, and Michigan. Ports along its shores include Chicago, Illinois, Gary, Indiana, Milwaukee and Green Bay, Wisconsin, and Muskegon, Michigan. To the north, the lake is flanked by long bays, including Green Bay in the northwest, and Grand Traverse and Little Traverse bays in the northeast. The word michigan is believed to come from the Ojibwe ᒥᓯᑲᒥ (michi-gami or mishigami), meaning "great water".

Lake Huron (/ˈhjʊərɒn, -ən/ HURE-on, -⁠ən) is one of the five Great Lakes of North America. It is shared on the north and east by the Canadian province of Ontario and on the south and west by the U.S. state of Michigan. The name of the lake is derived from early French explorers who named it for the indigenous people they knew as Huron (Wyandot) inhabiting the region.Hydrologically, Lake Huron comprises the eastern portion of Lake Michigan–Huron, having the same surface elevation as Lake Michigan, to which it is connected by the 5-mile-wide (8.0 km), 20-fathom-deep (120 ft; 37 m) Straits of Mackinac. Combined, Lake Michigan–Huron is the largest freshwater lake by area in the world. The Huronian glaciation was named from evidence collected from the Lake Huron region. The northern parts of the lake include the North Channel and Georgian Bay. Saginaw Bay is located in the southwest corner of the lake. The main inlet is the St. Marys River from Lake Superior, and the main outlet is through the St. Clair River toward Lake Erie. Lake Huron has a fairly large drainage basin covering parts of Michigan and Ontario. Water flows through Lake Huron faster than the other Great Lakes with a retention time of only 22 years.

Lake Michigan–Huron (also Huron–Michigan) is the body of water combining Lake Michigan and Lake Huron, which are joined through the 5-mile-wide (8.0 km), 295-foot-deep (90 m), open-water Straits of Mackinac. Huron and Michigan are hydrologically a single lake because the flow of water through the straits keeps their water levels in overall equilibrium. Although the flow is generally eastward, the water moves in either direction depending on local conditions. Combined, Lake Michigan–Huron is the largest freshwater lake by area in the world. Lake Superior is larger than either individually, so it is counted as the largest of the Great Lakes when Lake Michigan and Lake Huron are considered separately.

Michigan (/ˈmɪʃɪɡən/ MISH-ig-ən) is a peninsular state in the Great Lakes region of the Upper Midwestern United States. It shares water and land boundaries with Minnesota to the northwest, Wisconsin to the west, Indiana and Illinois to the southwest, Ohio to the southeast, and the Canadian province of Ontario to the east, northeast and north. With a population of 10.14 million and an area of 96,716 sq mi (250,490 km), Michigan is the tenth-largest state by population, the 11th-largest by area, and the largest by total area east of the Mississippi River. The state capital is Lansing, while its most populous city is Detroit. The Metro Detroit region in Southeast Michigan is among the nation's most populous and largest metropolitan economies. Other important metropolitan areas include Grand Rapids, Flint, Ann Arbor, Kalamazoo, the Tri-Cities, and Muskegon.

Michigan consists of two peninsulas: the heavily forested Upper Peninsula (commonly called "the U.P."), which juts eastward from northern Wisconsin, and the more populated Lower Peninsula, stretching north from Ohio and Indiana. The peninsulas are separated by the Straits of Mackinac, which connects Lake Michigan and Lake Huron, and are linked by the 5-mile-long Mackinac Bridge along Interstate 75. Bordering four of the five Great Lakes and Lake St. Clair, Michigan has the longest freshwater coastline of any U.S. political subdivision, measuring 3,288 miles. The state ranks second behind Alaska in water coverage by square miles and first in percentage, with approximately 42%, and it also contains 64,980 inland lakes and ponds.

The Upper Peninsula of Michigan—also known as Upper Michigan or colloquially the U.P. or Yoop—is the northern and more elevated of the two major landmasses that make up the U.S. state of Michigan; it is separated from the Lower Peninsula by the Straits of Mackinac. It is bounded primarily by Lake Superior to the north, separated from the Canadian province of Ontario at the east end by the St. Marys River, and flanked by Lake Huron and Lake Michigan along much of its south. Although the peninsula as a geographic feature extends into the state of Wisconsin, the state boundary follows the Montreal and Menominee rivers and a line connecting them.

First inhabited by Algonquian-speaking native American tribes, the area was explored by French colonists, then occupied by British forces, before being ceded to the newly established United States in the late 18th century. After being assigned to various territorial jurisdictions, it was granted to the newly formed state of Michigan as part of the settlement of a dispute with Ohio over the city of Toledo. The region's exploitable timber resources and the discovery of iron and copper deposits in the 19th century brought immigrants, especially Finnish, French Canadian, Swedish, Norwegian, Cornish, and Italian; the peninsula includes the only counties in the United States where a plurality of residents claim Finnish ancestry. The area's economy declined in the 20th century when all of the readily available minerals had been removed, and it became largely dependent on logging and tourism.

The Lower Peninsula of Michigan, also known as Lower Michigan, is the larger, southern and less-elevated of the two major landmasses that make up the U.S. state of Michigan. It is separated from the Upper Peninsula by the Straits of Mackinac. The Lower Peninsula is surrounded by water on all sides except its southern border, which it shares with Indiana and Ohio.

Although the Upper Peninsula is commonly referred to as the U.P., it is uncommon for the Lower Peninsula to be called the L.P. Because of its recognizable shape, the Lower Peninsula is nicknamed The Mitten, with the eastern region identified as The Thumb. This has led to several folkloric creation myths for the area, one being that it is the handprint of Paul Bunyan, a giant lumberjack and popular European-American folk character in Michigan. When asked where they live, peninsula residents may hold up their right hand and point to a spot on the palmar side to indicate the location.