San Juan is its capital

I think it could be either:

Which length description are you looking for?:

6,4

10*

puerto rico

'san juan is its capital' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for puerto rico that I've seen before include "Well-filled country" , "Self-governing American commonwealth in the Caribbean" , "Caribbean location" , "Caribbean island" , "WI island associated with the US" .)

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