That's close to the latitude of the Antarctic Circle.
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The line of latitude at 66 degrees 30 minutes south is known as the Antarctic Circle. This line marks the southernmost point at which the sun can be seen at its highest point in the sky during the December solstice. On this line, there will be one day per year where the sun does not set (during the summer solstice) and one day where it does not rise (during the winter solstice).
That would be the "parallel of 66 degrees north".
The Arctic Circle is located only about 1/2 degree north of that parallel.
The Arctic Circle is located at approximately 66.5 degrees latitude north. This corresponds to 66 degrees and 30 minutes north.
You're talking about the 'Arctic Circle'.
The island possession located at approximately 18 degrees N latitude and 66 degrees W longitude is Puerto Rico.
Finland
The imaginary line located at 66.5 degrees south latitude is called the Antarctic Circle. This is the southernmost latitude at which the sun can remain continuously above or below the horizon for 24 hours during the summer and winter solstices, respectively. It marks the boundary of the Antarctic region.