Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Q: Sentence: 'Koh Chang is an exotic island resort in Thailand which is obscured by its more famous counterparts , the island resorts of Phuket and Koh Samui.It is the third largest island in Thailand behind Phuket and Koh Samui respectively .', Argument/Subject 1: 'koh chang', Argument/Subject 2: 'thailand'
A:
be island in