I suppose you could put the continent your island is attached or associated with. For example, Hawaii is a state of the United States, The United States is primarily concidered North America.
Maybe I should have made this poll to represent what country you are from but I figured that people may have found that a little too personal. That is why I made it be continents and not countries. Besides, to make a graphical poll like this, there would be no way I could list all the countries for youto tick off. Continents? Only 7.