New Caledonia 's National Park of the Coral Sea covers 1.3 million square kilometers . Green Island Marine Park , less than 20 kilometers from the capital , is great for tourism . The world 's largest marine managed area is the U.S. National Remote Islands Marine National Monument .
New Caledonia 's Natural Park of the Coral Sea covers 1.3 million square kilometers . Signal Island Marine Park , less than 20 kilometers from the capital , is great for snorkeling . The world 's largest marine managed area is the U.S. Pacific Remote Islands Marine National Monument .