20,000 leagues away

from Justin Timberlake – Blue Ocean Floor Lyrics on Rap Genius

Meaning

While this shows how big the distance is that he is willing to travel it is also in all likeliness a reference to the title of the novel Twenty Thousand Leagues Under the Sea by Jules Verne.
It has been turned into a movie quite often and the title itself has become a point of popcultural reference.

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