It is one of the natural world's most magnificent and colorful wonders and a must-see for most visitors to Australia. Described scientifically, the Great Barrier Reef is the largest system of corals and associated life forms on earth. Not one, but a maze of 2,900 reels and many islands, it stretches for more than 2,300 km (1,429 miles) along the northern Queensland coast. As a mature ecosystem that has evolved over hundreds of thousands of years, and one of the world's most precious natural treasures, the fragility of the Great Barrier Reef cannot be overestimated.

	QuickFacts Location: Queensland coast World Heritage Criteria: Natural (All Four) Best Time to Go: Dry season (April to October) Area: 35 million hectares (86 million acres)

The reef is a major feeding ground for large populations of the endangered dugong, a large herbivorous marine mammal. Humpback whales breed here, and endangered green and loggerhead turtles nest. Sharing this environment are numerous other animal groups, including anemones, crustaceans, and marine worms. Above the reef, the tropical skies are alive with sea birds.

Although World Heritage-listed, the reef supports activities that include commercial fishing boats, scientific research, and tourism controlled by the Great Barrier Reef Marine Park Authority.

Visitors to the Great Barrier Reef can choose from about 20 island resorts, ranging from five-star to backpacker, or a full accommodation range on the nearby mainland, from where they can take a day cruise to the reef. While Cairns is the main gateway to the reef, boats leave regularly from all mainland towns and cities. Some anchor near the reef for the day, and others moor at large, purpose-built platforms holding up to 400 people. Either way, the day is spent swimming and diving with some of the world's most colorful fish amid valleys of living coral.

All resorts, cruise-boat operators, and reef platforms must be approved by the marine park authority and are continually monitored to ensure they are not damaging reef life. Cruise-boat operators now include educational talks and films as part of their reef tours, while some have scientific programs. On the (few) bad-weather days, tourists can visit the world's largest living coral reef aquarium in Townsville, the only public aquarium in the world where corals have spawned.

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