As a geospatial analyst with a keen interest in cartography and geography, I often find myself delving into the intricacies of coastlines. The question of which state has the longest coastline is a fascinating one that requires a nuanced understanding of what constitutes a coastline and how it is measured.

Coastlines can be measured in various ways, such as the length of the shoreline along the coast, the length of the coastline including all bays and inlets, or the length of the coastline including all bays, inlets, and indentations. The method of measurement can significantly affect the outcome.

In the United States, Alaska is widely recognized as having the longest coastline. It stretches for approximately 6,640 miles when considering the main coastline and the coastlines of the numerous islands that are part of the state. Alaska's coastline is a complex and rugged one, featuring fjords, bays, and islands that add to its overall length.

However, when discussing the longest coastline in terms of freshwater, Michigan stands out. The state is surrounded by the Great Lakes, which are the largest group of freshwater lakes on Earth by total area. Michigan's freshwater coastline is measured to be around 3,288 miles, which is indeed longer than any other state's freshwater coastline and is second only to Alaska's total coastline.

It is important to note that the World Book Encyclopedia's statement regarding Michigan's shoreline being "more than any other state except Alaska" is accurate when referring to freshwater coastlines. Michigan's extensive shoreline along the Great Lakes is a significant geographical feature that contributes to its status as having the longest freshwater coastline.

In summary, while Alaska has the longest coastline in the United States, Michigan holds the title for the longest freshwater coastline. Both states boast unique and extensive coastlines that are integral to their geography and ecology.

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Michigan has the longest freshwater coastline in the US and the second longest coast line in the US next to Alaska. World Book Encyclopedia (v.13, p.500 of the 2000 edition) states that Michigan's shoreline, at 3,288 miles is "more than any other state except Alaska.read more >>