Hainan is a tropical island and has a vast stretch of tropical primeval forests, mountain range, rivers and beaches. There are over 560 species of animals and 4200 types of plants on the island. It has great mineral reserves and is rich in oil and natural gas. Among the minerals of proved deposits, iron-ore and arenaceous quartz deposits rank the 1st in China, natural gas, zirconium, nitrogenous fertilizer rock and gems the 2nd, titanium the 3rd, and oil-shale the 4th. Tourism becomes a leading industry in Hainan.