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Florida is the longest border on the Atlantic Ocean.
illinois
if you are comparing the lengths of the bordering states themselves rather than the lengths of the borders they share with North Carolina then it is Tennessee
California has the longest border with Nevada.
Mississippi has the longest border with Alabama.
Sacramento, California is the capital of the state that has the longest border on the Pacific Ocean
In the west, the state of Montana has the longest linear border with Canada. In the east, the state of Michigan has the longest border, including the Great Lakes.
Florida has the longest coastline border on the Gulf of Mexico with 770 miles. In Mexico, the state of Veracruz has the longest border with the Gulf of Mexico with 463 miles.
california
Texas
nsw
Tennessee