Lake Michigan is one of the five Great Lakes of North America and is the only one located entirely within the United States. It is bordered by four states: Illinois, Indiana, Wisconsin, and Michigan. The lake covers an area of about 22,300 square miles, making it the second-largest Great Lake by volume and the third-largest by surface area. The lake is known for its beautiful beaches, recreational activities, and diverse ecosystems. Major cities along its shores include Chicago, Milwaukee, and Green Bay. Lake Michigan plays a vital role in the local economy, supporting tourism, shipping, and fishing industries.