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Definitely an Argiope sp.. To my knowledge Argiope anasuja is the only one found on the Maldives, but yours looks a little bit different. So I am not 100% sure if this is Argipe anasuja. On islands there is always the problem of introduced species.
http://www.projectnoah.org/spottings/297...
http://en.wikipedia.org/wiki/Argiope_ana...