Lake Michigan is classified as a glacial lake. It is one of the five Great Lakes of North America and is unique because it is the only one entirely located within the United States. Formed during the last Ice Age, Lake Michigan is a vital freshwater resource, supporting diverse ecosystems and providing recreational opportunities. The lake also plays an essential role in regional climate and commerce, influencing the surrounding areas and contributing to the economy through shipping and tourism. Its shores are home to many cities, parks, and scenic landscapes.