Detailed Instructions: From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.
Q: Given Relationship: 'be island of', Sentence: 'AFCD also helped mainland counterparts track three green turtles last year , from Gangkou National Nature Reserve , Guangdong , to Hainan Island and Okinawa , Japan .'
A:
Island