The word insular appears in the following sentences from Moby-Dick:
Chapter 1 > Paragraph 2 > Sentence 1:
There now is your insular city of the Manhattoes, belted round by wharves as Indian isles by coral reefs—commerce surrounds it with her surf.
Chapter 7 > Paragraph 2 > Sentence 6:
Each silent worshipper seemed purposely sitting apart from the other, as if each silent grief were insular and incommunicable.
Chapter 16 > Paragraph 16 > Sentence 2:
I saw that under the mask of these half humorous innuendoes, this old seaman, as an insulated Quakerish Nantucketer, was full of his insular prejudices, and rather distrustful of all aliens, unless they hailed from Cape Cod or the Vineyard.
Chapter 58 > Paragraph 11 > Sentence 2:
For as this appalling ocean surrounds the verdant land, so in the soul of man there lies one insular Tahiti, full of peace and joy, but encompassed by all the horrors of the half known life.
Concordance for the word insular from Moby-Dick.