Lyla Lindsey
The Great Barrier Reef, a complex of coral reefs, shoals, and islets, is located off the northeastern coast of Australia. It is the largest coral reef system in the world, stretching over 2,300 kilometres (1,430 miles) and covering an area of 348,000 square kilometres. The reef is a site of remarkable variety and beauty, boasting the world's largest collection of coral reefs, with approximately 400 types of coral, over 1,500 species of fish, and around 4,000 types of molluscs. It is also home to rare species of whales and six of the world's seven species of marine turtles.
| Characteristics | Values |
|---|---|
| Location | Off the northeastern coast of Australia |
| Length | 2,300 km (1,430 mi) |
| Width | 250 km |
| Depth range | From low water mark to over 2,000 metres deep |
| Number of reefs | 2,500 individual reefs |
| Number of islands | Over 900 islands |
| Number of coral species | 400 types |
| Number of fish species | Over 1,500 species |
| Number of mollusc species | 4,000 types |
| Number of bird species | 240 species |
| Number of turtle species | Six of the world's seven species |
| Number of whale and dolphin species | Over 30 species |
| Year of inscription as World Heritage Site | 1981 |
| Area covered | 348,000 square kilometres |
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What You'll Learn
The Great Barrier Reef is 2,300km long
The Great Barrier Reef is a natural wonder, a World Heritage Site, and one of the seven natural wonders of the world. It is located off the northeastern coast of Australia and is the world's largest coral reef ecosystem. It is also the world's largest single structure made by living organisms. Stretching over 2,300 kilometres, the Great Barrier Reef is a diverse and beautiful site, home to a vast array of marine life.
The reef is made up of around 3,000 coral reefs and over 900 islands, including continental islands and coral cays. It is a vital part of Australia's identity and a cherished national icon. The Great Barrier Reef is also an important economic asset, generating billions of dollars annually from tourism and fisheries.
The reef provides a habitat for numerous species, including 1,500 species of fish, 4,000 types of molluscs, and 1,000 species of echinoderms. It is also home to threatened species such as the dugong ('sea cow') and the large green turtle. The islands of the Great Barrier Reef support a diverse range of plant species, with the Whitsunday region being the most diverse, supporting 1,141 plant species.
The Great Barrier Reef faces several threats, including rising levels of ocean acidification, pollution, and declining water quality. Farming practices, such as the use of pesticides and fertiliser runoff, have detrimental effects on the coral, reducing light availability and releasing toxic substances into the environment. Despite these challenges, the Great Barrier Reef remains a vibrant and spectacular ecosystem, providing some of the most breathtaking scenery on Earth.
The Great Barrier Reef is a globally significant entity, offering remarkable variety and beauty. Its vast expanse, stretching across thousands of kilometres, showcases the intricate interplay between marine life and the natural environment. The reef's longevity, formed over millions of years, serves as a testament to the resilience and fragility of our planet's ecosystems.
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It's off Australia's northeast coast
The Great Barrier Reef is a complex of coral reefs, shoals, and islets in the Pacific Ocean off Australia's northeast coast. It is the longest and largest reef complex in the world, stretching over 2,300km (1,430mi) down Australia's eastern coastline. The Great Barrier Reef was designated a World Heritage Site in 1981 and covers an area of 348,000 square kilometres. It is home to over 1,600 species of fish, about 400 species of coral, 4,000 species of mollusc, and some 240 species of birds, as well as a great diversity of sponges, anemones, marine worms, crustaceans, and other species.
The Great Barrier Reef has been formed over millions of years from the skeletons and skeletal waste of marine organisms. The “bricks” in the reef framework are formed by the calcareous remains of coral polyps and hydrocorals, while the “cement” that binds these remains together is formed by coralline algae and bryozoans. The reef's substrate may have needed to build up from the sediment until its edge was too far away for suspended sediments to inhibit coral growth. The Great Barrier Reef's warm waters, with temperatures ranging from 70 to 100 °F (21 to 38 °C), have enabled the corals to flourish.
The Great Barrier Reef is under threat from rising levels of ocean acidification, pollution, and declining water quality. Ocean acidification occurs when excess atmospheric carbon dioxide is absorbed into the ocean, reducing the amount of aragonite, a key mineral for coral growth. Pollution from farming and industrial activities also poses a significant risk to the reef's health, with contaminants such as sediments, pesticides, and industrial waste entering the water. Efforts have been made to improve land management practices and water quality, but the Great Barrier Reef remains vulnerable to these environmental challenges.
The Great Barrier Reef offers a range of coastal experiences, including snorkelling, scuba diving, and exploring the diverse marine life. It is a popular destination for tourists seeking to discover the underwater playground and enjoy the warm waters and sunshine. The reef is accessible from various airports, including Cairns Airport and Bundaberg Regional Airport, and offers pre-booked transfers and transportation options. The Whitsunday Islands, with their green vegetated islands and sandy beaches, are a particularly magnificent vista within the Great Barrier Reef.
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The reef is a World Heritage Site
The Great Barrier Reef, located off the northeastern coast of Australia, is a World Heritage Site. It was designated as a World Heritage Site in 1981 and is one of 29 natural, marine properties on the World Heritage List that contain coral reef systems. The Great Barrier Reef is the world's most extensive coral reef ecosystem and is a globally outstanding and significant entity. It covers an area of 348,000 square kilometres and extends across a contiguous latitudinal range of 14o (10oS to 24oS).
The Great Barrier Reef is a site of remarkable variety and beauty. It contains the world's largest collection of coral reefs, with 400 types of coral, 1,500 species of fish, and 4,000 types of molluscs. It also holds great scientific interest as the habitat of species such as the dugong ('sea cow') and the large green turtle, which are threatened with extinction. The reef is home to thirty species of cetaceans, including the dwarf minke whale, Indo-Pacific humpback dolphin, and humpback whale.
The ecological integrity of the Great Barrier Reef is enhanced by its unparalleled size and current good state of conservation. It is one of the best-managed World Heritage properties, and Australia has a strong planning and investment framework in place to address key threats to the reef. However, the reef faces various natural pressures, including cyclones, crown-of-thorns starfish outbreaks, and sudden large influxes of freshwater from extreme weather events. Human activities such as tourism, shipping, and coastal developments, including ports, also pose challenges to the reef's health.
Climate change is the greatest threat to the Great Barrier Reef and coral reefs worldwide. Rising levels of ocean acidification, caused by the absorption of excess atmospheric carbon dioxide, alter the chemistry of the ocean's water and reduce the amount of aragonite, a key mineral for coral growth. Additionally, pollution and declining water quality, such as farm runoff and the release of nitrate-laden water, negatively impact the reef's health. Despite these challenges, the Great Barrier Reef remains a World Heritage Site of outstanding universal value, providing some of the most spectacular scenery on Earth.
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It's home to over 1,500 species of fish
The Great Barrier Reef, located off the northeastern coast of Australia, is home to an incredibly diverse array of marine life, including over 1,500 species of fish. This vast array of reef fish includes colourful and iconic species such as parrotfish, butterflyfish, angelfish, wrasses, clownfish, red bass, red-throat emperor, snapper, and coral trout. The reef also hosts various types of sharks and rays, such as reef sharks, whale sharks, manta rays, and stingrays, which play a crucial role in maintaining the ecosystem's balance.
One of the most well-known residents of the Great Barrier Reef is the clownfish, famous for its symbiotic relationship with sea anemones. Clownfish find shelter among the anemones' poisonous tentacles, protecting them from predators, while also keeping the anemones clean and healthy. This fascinating partnership showcases the intricate relationships that exist within the reef ecosystem.
The Great Barrier Reef is also a critical habitat for endangered species such as dugongs, often referred to as "sea cows," and the large green turtle. These species highlight the scientific importance of the reef and the need for conservation efforts to protect their fragile habitats.
In addition to its rich marine life, the Great Barrier Reef itself is a complex and diverse ecosystem. It includes shallow inshore areas, mid-shelf and outer reefs, and waters beyond the continental shelf that reach depths of over 2,000 metres. The reef is formed by the skeletons and skeletal waste of countless living marine organisms, primarily coral polyps and hydrocorals, which create the intricate structures that make up the reef framework.
The Great Barrier Reef is currently facing several threats, including rising ocean acidification levels, pollution, and unsustainable fishing practices. These issues have led to a decline in coral coverage and biodiversity within the reef. Conservation efforts, such as the Reef 2050 plan and the establishment of protected areas, aim to address these challenges and preserve the incredible diversity and beauty of the Great Barrier Reef for future generations to enjoy.
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Pollution and farm runoff are key threats
The Great Barrier Reef, a World Heritage Site, is located off the northeastern coast of Australia. It is the world's most extensive coral reef ecosystem, covering an area of 348,000 square kilometres and extending across a contiguous latitudinal range of 14o (10oS to 24oS). The reef includes a wide depth range, from vast shallow inshore areas to reefs beyond the continental shelf, more than 2,000 metres deep.
Agricultural runoff also introduces pesticides and heavy metals, such as lead, mercury, and arsenic, into the reef environment. These toxins are detrimental to coral health and can be consumed by coral, fish, and other reef animals, potentially introducing toxic substances into their systems. Additionally, over 90% of the pollution in the Great Barrier Reef during tropical flood events comes from farm runoff, which includes excess fertilisers, herbicides, and eroded soil.
To mitigate these issues, various measures have been implemented, including the establishment of the Reef Quality Partnership, improved land management practices, and the creation of the Queensland Wetland program. Conservation groups, such as Greening Australia, are also working on rehabilitating coastal wetlands, which act as natural filters for toxins and help trap sediment. Stricter government regulations regarding fertiliser use, pesticide application, and sustainable agricultural practices are vital to protecting coral reefs.
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Frequently asked questions
The Great Barrier Reef is located off the northeastern coast of Australia and extends up to 250 kilometres offshore.
The five most popular airports leading to the reef are: Cairns Airport (CNS), Bundaberg Regional Airport (BDB), Hamilton Island Airport (HTI), Port Douglas, and Lady Elliot Island Eco Resort.
Generally, May to October is a great time to visit the reef as the water is warm and underwater visibility is at its best.
The Great Barrier Reef is home to over 1,500 species of fish, about 400 species of coral, 4,000 species of mollusks, and some 240 species of birds. It is also home to rare species of whales and six of the world's seven species of marine turtles.
The Great Barrier Reef offers a variety of activities such as scuba diving, snorkeling, and flying over the reefs.
