Minnesota is a U.S. state in the Midwestern United States. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the 32nd state on May 11, 1858. Known as the "Land of 10,000 Lakes", the state's name comes from a Dakota word for "clear water".
Minnesota is the northernmost U.S. state apart from Alaska; its isolated Northwest Angle in Lake of the Woods is the only part of the 48 contiguous states lying north of the 49th parallel. The state is part of the U.S. region known as the Upper Midwest and part of North America's Great Lakes Region. It shares a Lake Superior water border with Michigan and a land and water border with Wisconsin to the east. Iowa is to the south, North Dakota and South Dakota are to the west, and the Canadian provinces of Ontario and Manitoba are to the north. With 86,943 square miles (225,180 km2), or approximately 2.25% of the United States, Minnesota is the 12th-largest state.
Minnesota contains some of the oldest rocks found on earth, gneisses some 3.6 billion years old, or 80% as old as the planet. About 2.7 billion years ago, basaltic lava poured out of cracks in the floor of the primordial ocean; the remains of this volcanic rock formed the Canadian Shield in northeast Minnesota. The roots of these volcanic mountains and the action of Precambrian seas formed the Iron Range of northern Minnesota. Following a period of volcanism 1.1 billion years ago, Minnesota's geological activity has been more subdued, with no volcanism or mountain formation, but with repeated incursions of the sea, which left behind multiple strata of sedimentary rock.
In more recent times, massive ice sheets at least one kilometer thick ravaged the landscape of the state and sculpted its current terrain. The Wisconsin glaciation left 12,000 years ago. These glaciers covered all of Minnesota except the far southeast, an area characterized by steep hills and streams that cut into the bedrock. This area is known as the Driftless Zone for its absence of glacial drift. Much of the remainder of the state outside of the northeast has 50 feet (15 m) or more of glacial till left behind as the last glaciers retreated. Gigantic Lake Agassiz formed in the northwest 13,000 years ago. Its bed created the fertile Red River valley, and its outflow, glacial River Warren, carved the valley of the Minnesota River and the Upper Mississippi downstream from Fort Snelling. Minnesota is geologically quiet today; it experiences earthquakes infrequently, and most of them are minor.
The state's high point is Eagle Mountain at 2,301 feet (701 m), which is only 13 miles (21 km) away from the low of 601 feet (183 m) at the shore of Lake Superior. Notwithstanding dramatic local differences in elevation, much of the state is a gently rolling peneplain.
Two major drainage divides meet in the northeastern part of Minnesota in rural Hibbing, forming a triple watershed. Precipitation can follow the Mississippi River south to the Gulf of Mexico, the Saint Lawrence Seaway east to the Atlantic Ocean, or the Hudson Bay watershed to the Arctic Ocean.
The state's nickname, The Land of 10,000 Lakes, is no exaggeration; there are 11,842 Minnesota lakes over 10 acres (0.040 km2) in size. The Minnesota portion of Lake Superior is the largest at 962,700 acres (3,896 km2) and deepest (at 1,290 ft (390 m)) body of water in the state. Minnesota has 6,564 natural rivers and streams that cumulatively flow for 69,000 miles (111,000 km). The Mississippi River begins its journey from its headwaters at Lake Itasca and crosses the Iowa border 680 miles (1,090 km) downstream. It is joined by the Minnesota River at Fort Snelling, by the St. Croix River near Hastings, by the Chippewa River at Wabasha, and by many smaller streams. The Red River, in the bed of glacial Lake Agassiz, drains the northwest part of the state northward toward Canada's Hudson Bay. Approximately 10.6 million acres (42,900 km²) of wetlands are contained within Minnesota's borders, the most of any state except Alaska.
Minnesota has four ecological provinces: Prairie Parkland in the southwestern and western parts of the state, the Eastern Broadleaf Forest (Big Woods) in the southeast, extending in a narrowing strip to the northwestern part of the state, where it transitions into Tallgrass Aspen Parkland, and the northern Laurentian Mixed Forest, a transitional forest between the northern boreal forest and broadleaf forests to the south. These northern forests are a vast wilderness of pine and spruce trees mixed with patchy stands of birch and poplar.
Much of Minnesota's northern forest underwent logging at some time, leaving only a few patches of old growth forest today in areas such as in the Chippewa National Forest and the Superior National Forest where the Boundary Waters Canoe Area Wilderness has some 400,000 acres (161,874 ha) of unlogged land. Although logging continues, regrowth keeps about one third of the state forested. Nearly all of Minnesota's prairies and oak savannas have been destroyed or fragmented because of farming, grazing, logging, and suburban development.
While loss of habitat has affected native animals such as the pine marten, elk, woodland caribou, and bison, others like whitetail deer and bobcat thrive. The state has the nation's largest population of timber wolves outside Alaska, and supports healthy populations of black bear and moose. Located on the Mississippi Flyway, Minnesota hosts migratory waterfowl such as geese and ducks, and game birds such as grouse, pheasants, and turkeys. It is home to birds of prey including the largest number of breeding pairs of bald eagles in the lower 48 states as of 2007, red-tailed hawk, and snowy owl. The lakes teem with sport fish such as walleye, bass, muskellunge, and northern pike, and streams in the southeast are populated by brook, brown, and rainbow trout.