Great Barrier Reef: Quick Facts

The Great Barrier Reef is the world's longest and largest reef complex, located off the northeastern coast of Australia in the Pacific Ocean. It stretches over 1,250 miles (2,000 km) and is composed of approximately 2,100 individual reefs and 800 fringing reefs. Formed over millions of years from the skeletons of marine organisms like coral polyps and coralline algae, it supports a vast array of life, including over 1,500 species of fish and numerous species of coral, sea turtles, and birds. The reef is a significant tourist attraction and is largely protected within the Great Barrier Reef Marine Park, a UNESCO World Heritage site. However, it faces threats from coral bleaching, invasive species, and cyclones.

The Great Barrier Reef is located off the northeastern coast of Australia, in the Pacific Ocean and the Coral Sea. This extensive reef system stretches for over 1,250 miles (2,000 km). It is situated approximately 10 to 100 miles (16 to 160 km) offshore. The reef is a complex of approximately 2,100 individual reefs and 800 fringing reefs.

The Great Barrier Reef is home to an incredible diversity of life. It hosts at least 450 species of hard coral, along with anemones, sponges, worms, gastropods, lobsters, crayfish, prawns, and crabs. The waters teem with over 1,500 species of fish, including wrasses, damselfish, triggerfish, angelfish, rays, and sharks. Six of the seven species of sea turtles, numerous sea snakes, and nearly two dozen bird species also inhabit the reef.

Plant life on the reef's cays is limited, with some mangrove varieties present in the northern areas. Encrusting red algae form a characteristic purplish-red rim, while green algae are also common.

The Great Barrier Reef, located off the coast of Queensland, Australia, is the world's largest reef complex. It is formed from the accumulated skeletons and skeletal waste of marine organisms, primarily coral polyps and hydrocorals. These calcareous remains are cemented together by coralline algae and bryozoans. Over millions of years, this process has created the extensive reef structure.

The reef grows on a shallow continental shelf in warm waters, typically where temperatures do not fall below 21°C (70°F). Changes in sea level over the last two million years have also influenced its shape, with erosion and solution weathering occurring during glacial periods and new reef growth over older landscapes as sea levels rose. The accumulation of carbonate sand and mud, along with trapped sediment from plants and algae, further contributes to the reef's complex structure.

The Great Barrier Reef is a vital natural wonder, serving as the world's largest reef complex and a significant tourist attraction. It supports an incredible diversity of life, including over 1,500 species of fish and numerous other marine organisms. For people, it offers economic benefits through tourism and provides opportunities for observing coral life.

However, the reef faces serious threats. These include coral bleaching caused by rising sea temperatures and climate change, as well as damage from predatory species like the crown-of-thorns starfish. Human activities such as overfishing, pollution, and sedimentation also pose risks to its delicate ecosystem. Protecting this natural heritage is crucial for both biodiversity and human interests.

The Great Barrier Reef faces threats from coral bleaching, invasive species like the crown-of-thorns starfish, and human activities such as overfishing and pollution. Climate change, leading to rising sea temperatures and ocean acidification, is a major driver of coral bleaching.

To protect the reef, efforts include managing marine park areas, controlling petroleum drilling, and regulating commercial fishing. Addressing climate change is crucial, as it exacerbates bleaching events. Reducing pollution and sedimentation from land-based erosion also helps maintain water quality.