Lake Michigan
The largest lake lying entirely within one country
Lake Michigan is the only one of the Great Lakes to lie wholly within the United States, and it is the largest lake on Earth contained within a single nation. Bordered by four states and lapping the shore of Chicago, it pairs a great-lakes wildness — dunes, shipwrecks, and open-water gales — with one of the most densely populated coastlines in North America. Its eastern shore holds the largest freshwater dune system in the world, while its southern tip anchors a metropolis of millions. Hydrologically it is a single body of water with Lake Huron, joined at the Straits of Mackinac.
Carved by the same ice sheets that shaped its neighbours, Michigan spreads across about 57,800 square kilometres and drops to a maximum depth of 281 metres, second deepest of the Great Lakes. Prevailing westerly winds drive moisture across the lake to fall as heavy lake-effect snow on the Michigan side, and the same winds pile sand into the towering dunes of the eastern shore. The lake's waters mix seasonally, turning over in spring and fall, and its open expanses can generate steep, dangerous waves with little warning.
The Potawatomi, Ojibwe, and other peoples lived along its shores long before French voyageurs paddled its coast in the 17th century. Industrial cities — Chicago, Milwaukee, Gary — grew on its waters, drawing on the lake for shipping, drinking water, and power, and at times polluting it badly before modern controls. Today invasive zebra and quagga mussels have transformed its food web, clarifying the water while disrupting native fish. Beaches, lighthouses, and national lakeshores draw millions, making Michigan both an industrial workhorse and a beloved freshwater coast.