Question

1. We will always wait for you right here on this island where Koreans have lived for a long time.
--------------------------
What is the antecedent of the where clause?

a. this island
b. right here on this island
c. right here

============================
What is the relationship between 'right here' and 'on this island? Are both in apposition? Or are both adverbial phrases and not in apposition?

Answer 1

"where" is referring to a place, so it has to be "this island"

"right here" and "on this island" are adverbial phrases, not appositives. You can remove either one and the sentence will still make sense.