What does underwater of reef of Australian big fort have? Outspread the big fort reef of more than 2300 kilometers is such big, OK even from outside aerospace sees. 1997, CNN labels his one of 7 nature marvellous spectacle of world. 1981, this cay that supports diversification life is chosen to be world bequest. Attract more than 2 million tourist every year. It is comprised by more than 2900 individual cay and 900 islands. It is by billions of microbial call coral polyp. Cay area makes an appointment with kilometer of 350 thousand square, be equivalent to arranging the bulk of 70 million football ground or Japan. Regard the greatest life on the earth as the structure, big fort reef has phyletic and various ocean biology and avian, include 1, 500 kinds of fish, 5000 kinds of mollusc mix 215 kinds avian. The fish that cay has occupies the 10 ％ of world fish gross to control.