The phrase "the island of Manhattan" does not use figurative language in the sense that it refers directly to a specific geographical location. However, if you are looking for figurative language, it typically means that the phrase is representing or symbolizing something beyond its literal meaning.
Given the provided options and if we consider a broader context where Manhattan could symbolize something, a "metaphor" might fit best in describing its significance. However, as it stands alone, "the island of Manhattan" is more of a literal description.
If you must choose one from the options provided, I'd suggest:
Metaphor
This is assuming that the context you're looking at treats "Manhattan" as standing for aspects like urban life, culture, etc. If it’s purely geographic, then none of the options apply.