Oceania is composed of 14 independent nations, 14 dependencies and 5 territories integrated into other nations. Australia and New Zealand have a diversified and highly developed economy. Both countries concentrate 40% of the world's sheep, are the main wool producers and contribute more than a third of the world's production. Another important activity is mining; there are gold reserves in Papua New Guinea and nickel and iron in New Caledonia. A major source of income is tourism, it is operated by large industries that build very exotic hotels and get cruises and planes to attract world tourism.