Which is the longest coastline of any state in the U.S. excluding Alaska?

Michigan has the longest coastline of any state in the U.S., excluding Alaska, due to its unique geographical position and the abundance of freshwater lakes surrounding it. The state is bordered by four of the five Great Lakes—Lake Superior, Lake Michigan, Lake Huron, and Lake Erie. Additionally, Michigan has numerous islands and a complex shoreline that contributes to its extensive coastline.

The sheer length of Michigan's shoreline, approximately 3,288 miles, accounts for the state's extensive water boundaries. This remarkable feature is a direct result of its shape, the numerous peninsulas, and the fact that it is the only state that touches four of the five Great Lakes, making it a significant contributor to its total coastline length. The geographical features of the Great Lakes provide a diverse range of coastal environments, further enhancing Michigan's coastline.

In contrast, while states like Florida, California, and Texas have significant coastlines primarily along the ocean, they do not match the extensive lengths offered by Michigan's combination of Great Lake shorelines. Florida's coastline is extensive mainly due to its peninsular shape and ocean access, but it falls short when compared to Michigan's intricate network of inland water boundaries.