[Ans] What U.S. state has the longest coastline?

Step 1 : Introduction to the question "What U.S. state has the longest coastline?"

...A coastline or a seashore is the area where land meets the sea or ocean, or a line that forms the boundary between the land and the ocean or a lake. A precise line that can be called a coastline cannot be determined due to the Coastline paradox. 
The coastline, that narrow strip of land that borders the sea along a continent or an island, is an ideal place to see a constantly-changing landscape.

Step 2 : Answer to the question "What U.S. state has the longest coastline?"

Alaska:

With 6,640 miles of coastline, Alaska tops the list of U.S. states exposed to the ocean. The state's Pacific coast alone amounts to 5,580 miles, while the Arctic coast comes in at 1,060 miles long. Unlike the coastlines of many other states, however, the coast of "The Last Frontier" is rocky, icy and often at temperatures below freezing. In fact, most of this coastline is uninhabitable! Alaska also boasts the most shoreline mileage, at 33,904 miles. Source: NOAA Office for Coastal Management, SmashingLists

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