Leslie Massey
Heard Island and McDonald Islands are a group of uninhabited, remote sub-Antarctic islands located in the southwest Indian Ocean, about two-thirds of the way from Madagascar to Antarctica. The islands are around 4,100 kilometres southwest of Perth, Western Australia, 4,700 kilometres southeast of Africa, and 1,000 kilometres north of Antarctica. The islands were discovered in the mid-19th century and have been an Australian territory since 1947. They are one of the world's rare pristine island ecosystems, with a complete absence of human impact.
| Characteristics | Values |
|---|---|
| Location | About two-thirds of the way from Madagascar to Antarctica; in the Southern Ocean; in the southwest Indian Ocean; about 4,100 kilometres southwest of Perth, Western Australia; 4,700 kilometres southeast of Africa; 1,000 kilometres north of Antarctica; 450 kilometres northwest of the French territory of Îles Kerguelen; at around 53°S, 73°30’E |
| Area | 368-372 square kilometres (142-144 square miles) |
| Coastline | 101.9 kilometres (63 miles) |
| Climate | Antarctic, tempered by maritime setting; low seasonal and daily temperature ranges; low cloud cover; frequent precipitation; strong winds; snowfall year-round |
| Terrain | Bleak and mountainous; dominated by Big Ben, an active volcano of 2,745-metre elevation; 80% covered with ice; glaciers; snow and ice; marine zone where Antarctic waters converge with warmer waters |
| Wildlife | Vast colonies of penguins, petrels, elephant seals, fur seals |
| Human occupation | Uninhabited; intermittently inhabited by scientific research parties; 19th-century sealing; research activity from 1947 to 1955; winter research programme in 1992 |
| Sovereignty | Australian external territory since 1947; previously under British control |
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What You'll Learn
Heard Island and McDonald Islands are Australian external territories
The administration of HIMI is established by the Heard Island and McDonald Islands Act 1953, which places the territory under the jurisdiction of the Supreme Court of the Australian Capital Territory. The non-criminal laws of the Australian Capital Territory and the criminal laws of the Jervis Bay Territory apply to HIMI. The islands are contained within a 65,000-square-kilometre marine reserve and are primarily visited for research purposes. The Australian government permits limited fishing in the surrounding waters.
Heard Island and McDonald Islands contain Australia's only two active volcanoes: Mawson Peak and McDonald Island. Mawson Peak is the highest mountain with undisputed Australian sovereignty, as Australia's claim to the Australian Antarctic Territory, where the three highest mountains are located, is not recognised by most countries. Heard Island is dominated by Big Ben, an active volcano with an elevation of 2,745 metres. Volcanic activity has been observed at Heard Island since the mid-1980s, with fresh lava flows on the southwest flanks of the island.
The islands are a unique wilderness, providing an opportunity to observe ongoing geomorphic processes and glacial dynamics in an undisturbed environment. They are located south of the Antarctic Convergence, where colder Antarctic waters meet and sink beneath the slightly warmer waters of the subantarctic. Approximately 70% of Heard Island is permanently covered in glaciers, with isolated vegetated headlands emerging between them. The islands are biological hotspots, characterised by high numbers of seabirds and marine mammals, including vast colonies of penguins, petrels, elephant seals, and fur seals.
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They are uninhabited and can only be reached by sea
Heard Island and the McDonald Islands are uninhabited and can only be reached by sea. They are located in the Southern Ocean, approximately 1,700 km from the Antarctic continent and 4,100 km south-west of Perth, Australia. The islands are part of an external territory of Australia and lie in the southern Indian Ocean, about two-thirds of the way from Madagascar to Antarctica. They are among the most isolated islands in the Southern Ocean, and human occupation has been very restricted due to their remoteness and harsh climate.
The islands typically require a two-week voyage from Australia to visit. They were discovered in the mid-19th century and have been exploited for their seal population, as well as for scientific research. The McDonald Islands, in particular, have only had a few brief visits, and there has been no protracted stay on Heard Island since a winter research programme in 1992.
The islands are a unique wilderness, containing ongoing biological and physical processes undisturbed by humans. They are the only volcanically active subantarctic islands, providing an opportunity to observe geomorphic processes and glacial dynamics. Heard Island, the larger of the two, is dominated by Big Ben, an active volcano rising to a height of 2,745 meters. It is mostly covered in snow and glaciers, with isolated vegetated headlands emerging between the glaciers.
The islands have an Antarctic climate, with low seasonal and daily temperature ranges, frequent precipitation, and strong winds. Snowfall occurs throughout the year, and the winds are predominantly westerly and persistently strong. The harsh climate and remoteness of the islands make them challenging to access and inhabit.
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The islands contain Australia's only two active volcanoes
Heard Island and the McDonald Islands are located in the Southern Ocean, approximately 1,700 km from the Antarctic continent and 4,100 km southwest of Perth. The islands are an Australian external territory, lying on the Kerguelen Plateau in the Indian Ocean. They have been an Australian territory since 1947.
The second active volcano is on McDonald Island, which lies approximately 40 kilometres west of the Laurens Peninsula. Volcanic activity has dramatically altered the island, causing it to double in size and increase in elevation, resulting in the loss of all vegetation. This activity was recorded after the island was added to the UNESCO World Heritage List, demonstrating the dynamic nature of the landscape.
The islands are a unique wilderness, undisturbed by humans, and provide an opportunity to observe ongoing geomorphic processes and glacial dynamics. They are managed as a strict nature reserve by the Australian Antarctic Division, which aims to maintain natural conditions and ecological integrity.
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The islands are a unique wilderness with pristine ecosystems
Heard Island and the McDonald Islands are located in the Southern Ocean, about 4,100 kilometres southwest of Perth, Western Australia, 4,700 kilometres southeast of Africa, and 1,000 kilometres north of Antarctica. They are the only volcanically active subantarctic islands, with Mawson Peak on Heard Island being the highest mountain with undisputed Australian sovereignty. The islands are uninhabited and can only be reached by sea, with a typical voyage from Australia taking two weeks.
The rocky cliffs and coastal areas of Heard Island provide ideal breeding grounds for numerous species of seabirds, which play vital roles in nutrient cycling and predator-prey relationships. Elephant seals and Antarctic fur seals are the two main species of seals on the island, with the shores providing a crucial gathering spot for these massive marine mammals during the breeding season. The seals are important predators in the food web, feeding on fish, squid, and crustaceans, and helping to maintain the balance of the marine ecosystem.
The invertebrates on the island, including insects, spiders, and other arthropods, thrive primarily in the limited vegetated areas. Despite the harsh conditions, these invertebrates are well-adapted to the sub-Antarctic environment and play important roles as decomposers and as a food source for other creatures. The management of Heard Island and the McDonald Islands focuses on protecting their biodiversity and maintaining the natural conditions and ecological integrity of these pristine ecosystems.
The islands' remoteness and harsh climate have ensured that human occupation and research activity have been very restricted. The Australian Antarctic Division carefully manages access to the islands to protect their fragile environment and prevent the introduction of invasive species, which could threaten the delicate balance of the ecosystem. The islands were added to the National Heritage List in 2007 in recognition of their national heritage significance and are now managed as a strict nature reserve.
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They were added to the National Heritage List in 2007
Heard Island and McDonald Islands are located in the Southern Ocean, about 4,100 kilometres southwest of Perth, Western Australia. They are a group of uninhabited, volcanic islands that were discovered in the mid-19th century and have been an Australian territory since 1947. The islands are one of the wildest places on earth, with a smoking volcano, snow and glacial ice, and the world's stormiest waters. They are also one of the few pristine island ecosystems in the world, with no known introduction of alien plants or animals by humans.
In recognition of their unique natural and cultural heritage significance, the Heard and McDonald Islands were added to the National Heritage List in 2007. This listing provides an additional layer of protection for the islands, ensuring that any actions or developments that may impact their significant heritage values are referred to the responsible Minister for consideration. The islands are managed as a strict nature reserve by the Australian Antarctic Division, which aims to maintain natural conditions and ecological integrity while preventing the introduction of pathogens and non-native species.
The Heard and McDonald Islands are a popular destination for scientific expeditions and amateur radio operations. They provide a unique opportunity to study ongoing geomorphic processes and glacial dynamics, and the ecological and biological processes of recolonisation of seal and penguin populations. The islands also have a history of sealing and research activity, with human occupation mainly restricted to the 19th century and a period from 1947 to 1955.
The Australian government has expressed interest in establishing a permanent base in the region, and the islands continue to be an important site for scientific research and the study of sub-Antarctic ecosystems. The management of the islands as a nature reserve aims to balance the increasing human activity in the region with the need to preserve the natural conditions and unique ecosystem that led to their inclusion on the National Heritage List.
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Frequently asked questions
Heard Island is not in Australia, but it is an Australian external territory. It is a sub-Antarctic island in the southern Indian Ocean, about 4,100 kilometres southwest of Perth, Western Australia.
Heard Island is 43 kilometres long and 21 kilometres wide. It covers 368 square kilometres.
Yes, Heard Island is one of the only two active volcanoes in Australian territory. The other is on McDonald Island, which is a group of islands close to Heard Island.
