
The Coral Sea Islands are a group of islands situated in the South Pacific Ocean, northeast of Queensland, Australia. They constitute an external territory of Australia, officially known as the Coral Sea Islands Territory. The Coral Sea Islands were first charted in 1803 and became an Australian external territory in 1969 through the Coral Sea Islands Act. The territory covers 780,000 square kilometres, most of which is ocean, and includes Herald's Beacon Island, Osprey Reef, the Willis Group, and fifteen other reef/island groups.
| Characteristics | Values |
|---|---|
| Location | Off the northeast coast of Australia |
| Area | 780,000 sq. km (301,160 sq. mi) |
| Number of Islands | 18 |
| Status | External territory of Australia |
| Year of Acquisition by Australia | 1969 |
| Administering Department | Attorney-General's Department |
| Jurisdiction | Supreme Court of Norfolk Island |
| Applicable Laws | Laws of the Australian Capital Territory |
| Inhabited Islands | Willis Island |
| Highest Point | Cato Island |
| Economic Activity | Charter fishing and diving industry |
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What You'll Learn

The Coral Sea Islands are an external territory of Australia
The Coral Sea Islands, a group of small and mostly uninhabited tropical islands and reefs, constitute an external territory of Australia. They are situated in the Coral Sea, to the northeast of Queensland, Australia, and cover a vast sea area of about 300,000 square miles (780,000 square kilometres). The Coral Sea Islands were first charted in 1803, and in the 1870s and 1880s, the islands were mined for guano. However, the absence of a reliable supply of fresh water prevented long-term habitation.
Historically, the islands and reefs in the Coral Sea were considered British possessions due to Captain James Cook's annexation of the east coast of Australia and its off-lying islands in 1770. Australia's acquisition of the Coral Sea Islands began at federation in 1901. In 1936, increased Japanese fishing activities, along with renewed French and German territorial interests, heightened the strategic importance of the islands.
The Coral Sea Islands became an Australian external territory in 1969 with the Coral Sea Islands Act, which was amended in 1997 to include Elizabeth and Middleton Reefs. The laws of the Australian Capital Territory apply in the territory, and the Supreme Court of Norfolk Island exercises criminal jurisdiction. The territory includes Heralds Beacon Island, Osprey Reef, the Willis Group, and fifteen other reef/island groups.
The Coral Sea is known for its numerous coral formations, including the Great Barrier Reef, which extends about 2,000 kilometres (1,200 miles) along the northeast coast of Australia. The Great Barrier Reef is a major tourist attraction and is protected by the Great Barrier Reef Marine Park, established in 1975 to address growing environmental concerns. It was designated a UNESCO World Heritage Site in 1981.
The Coral Sea Islands are also home to a diverse range of flora and fauna. They support large populations of seabirds and are a significant site for commercial fishing. The Australian government has taken steps to protect the environment and conserve the natural resources of the Coral Sea Islands and their surrounding waters.
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The islands are mostly uninhabited
The Coral Sea Islands are a group of small, mostly uninhabited islands and reefs in the Coral Sea, northeast of Queensland, Australia. The islands were first charted in 1803 and mined for guano in the 1870s and 1880s, but the absence of a reliable source of fresh water prevented long-term habitation. The only inhabited island today is Willis Island, which has been home to a manned weather station since 1921.
The Coral Sea Islands became an Australian external territory in 1969 with the Coral Sea Islands Act, which was amended in 1997 to include Elizabeth and Middleton Reefs. The territory covers 780,000 square kilometres, most of which is ocean, and includes Herald's Beacon Island, Osprey Reef, the Willis Group, and fifteen other reef and island groups. The islands are spread over a vast sea area, with only a few square miles of actual land area.
The Coral Sea Islands are classified as a nature reserve, with commercial fishing permitted in some areas. They are home to large populations of seabirds and support a significant, albeit unquantified, charter fishing and diving industry. The islands are also a popular tourist destination, with Queensland residents making approximately 14.6 million visits to the Coral Sea reefs in 2008.
The Australian government has taken steps to protect the Coral Sea Islands, with the establishment of the Coral Sea Commonwealth Marine Reserve in 2013 and the Coral Sea Marine Park in 2017, which covers an area of 989,836 square kilometres. The laws of the Australian Capital Territory apply in the territory, and the Supreme Court of Norfolk Island exercises criminal jurisdiction.
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They are situated in the South Pacific Ocean
The Coral Sea Islands are a group of islands situated in the South Pacific Ocean, east of Queensland, Australia. They constitute an external territory of Australia, officially named the Coral Sea Islands Territory. The territory covers 780,000 square kilometres, most of which is ocean, extending east and south from the outer edge of the Great Barrier Reef. The islands themselves occupy only a few square miles of actual land area.
The Coral Sea Islands became an Australian territory in 1969 with the Coral Sea Islands Act, which was amended in 1997 to extend the boundaries of the territory to include Elizabeth and Middleton Reefs. The laws of the Australian Capital Territory apply in the Coral Sea Islands Territory, and the Supreme Court of Norfolk Island exercises criminal jurisdiction. The territory is uninhabited aside from a manned weather station on Willis Island, which has been in operation since 1921.
The Coral Sea Islands consist of widely scattered coral reefs and sand cays that support large populations of seabirds. The islands include Cato Island, the highest point in the territory; Chilcott Islet in the Coringa group; the Willis group; and Bird Islet and West Islet, which form part of Wreck Reefs. Other formations include Herald's Beacon Islet (part of Mellish Reef), Frederick Reef, Bougainville Reef, and Lihou Reef.
The Coral Sea, in which the islands are situated, is named after its numerous coral formations, including the Great Barrier Reef, the Lihou Reef, and the Chesterfield Islands. The sea extends 2,000 kilometres down the Australian northeast coast and is known for its species-rich coral reefs. The Coral Sea contains 49 different habitats that support more than 300 threatened species.
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The islands are composed of coral reefs and sand cays
The Coral Sea Islands are an external territory of Australia, comprising a group of small, mostly uninhabited tropical islands and reefs in the Coral Sea, northeast of Queensland, Australia. The Coral Sea itself is a marginal sea of the South Pacific, off the northeast coast of Australia. It was named for its numerous coral formations, which include the Great Barrier Reef, the world's largest reef system.
The Coral Sea Islands were first charted in 1803 and were mined for guano in the 1870s and 1880s, but the absence of a reliable supply of fresh water prevented long-term habitation. The only inhabited island in the Coral Sea Islands Territory today is Willis Island, which has had a manned weather station since 1921.
The islands and reefs in the Coral Sea were once thought to be British possessions due to Captain Cook's annexation of the east coast of Australia and its off-lying islands in 1770. However, Australia's acquisition of the Coral Sea Islands began at federation in 1901, and in 1968, the United Kingdom Government advised that it did not claim any right or interest in the islands inconsistent with the exercise of control by the Australian Government.
The Coral Sea Islands became an Australian external territory in 1969 with the Coral Sea Islands Act, which was amended in 1997 to extend the boundaries of the territory around Elizabeth and Middleton Reefs. The territory covers 780,000 square kilometres, most of which is ocean, extending east and south from the outer edge of the Great Barrier Reef.
The islands in the Coral Sea are composed of coral reefs and sand cays. A cay is a small, low-elevation island formed mostly from coral debris, sand, and shells. It sits on top of coral reefs and forms when ocean currents and waves deposit sediments in a concentrated area. Cays are dynamic and can shift, erode, or grow over time, depending on tides, winds, and storms. They are fragile and shaped by constant changes in the ocean's environment.
The coral cays of the Great Barrier Reef play a crucial role in the health of the reef and support a wide range of biodiversity, from nesting seabirds to critical turtle habitats. However, their ever-changing nature makes it essential to monitor these cays closely. Drone technology has emerged as a vital tool in this effort, offering exceptional detail in capturing their shifting landscapes.
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The Coral Sea Islands Act of 1969 declared them Australian territory
The Coral Sea Islands are a group of small and mostly uninhabited islands and reefs in the Coral Sea, northeast of Queensland, Australia. The only inhabited island in the Coral Sea Islands is Willis Island, which has been home to a manned weather station since 1921. The territory covers 780,000 square kilometres, most of which is ocean, extending east and south from the outer edge of the Great Barrier Reef. It includes Heralds Beacon Island, Osprey Reef, the Willis Group, and fifteen other reef/island groups. Cato Island is the highest point in the territory.
The Coral Sea Islands became an Australian external territory in 1969 with the Coral Sea Islands Act, which was amended in 1997 to expand the territory to include Elizabeth Reef and Middleton Reef. The laws of the Australian Capital Territory apply in the territory, and the Supreme Court of Norfolk Island exercises criminal jurisdiction. Commonwealth laws only apply when they are expressly stated to extend to the territory. The Coral Sea Islands Act of 1969 declared them Australian territory, and they are now Australia's tenth external territory.
Historically, the islands and reefs in the Coral Sea were considered British possessions due to Captain Cook's annexation of the east coast of Australia and its outlying islands in 1770. Australia's acquisition of the Coral Sea Islands began at federation in 1901. In the 1930s, increased Japanese fishing activity and growing French, German, and British territorial interests led to negotiations between the Australian and British governments over the ownership of the islands. In 1968, the United Kingdom Government advised that it did not claim any right or interest in the islands that would interfere with the Australian Government's effective government, administration, and control.
Today, the Commonwealth's interest in the Coral Sea Islands Territory is primarily through the Department of the Environment and the Department of Agriculture. The territory is a popular destination for foreign and Australian tourists, with Queensland residents making about 14.6 million visits to the Coral Sea reefs in 2008. The Coral Sea Commonwealth Marine Reserve was established in December 2013 to protect the environment, and a coalition of environmental NGOs is advocating for the creation of a large, highly protected Coral Sea Marine Park.
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Frequently asked questions
Yes, the Coral Sea Islands are an external territory of Australia.
The Coral Sea Islands Act of 1969 declared the islands to be Australian territory.
The Coral Sea is a marginal sea of the South Pacific off the northeast coast of Australia. It is known for its coral formations, including the Great Barrier Reef.
The Coral Sea Islands are mostly uninhabited. The only inhabited island is Willis Island, which has had a manned weather station since 1921.
The Coral Sea Islands Territory is an external territory of Australia that includes a group of small, mostly uninhabited tropical islands and reefs in the Coral Sea, northeast of Queensland. The territory covers 780,000 square kilometres, most of which is ocean.


















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