| Heard Island and McDonald Islands (2005) | Tromelin Island (2005) | |
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| Airports | - | 1 (2004 est.) |
| Airports - with unpaved runways | - | total: 1
under 914 m: 1 (2004 est.) |
| Area | total: 412 sq km
land: 412 sq km water: 0 sq km |
total: 1 sq km
land: 1 sq km water: 0 sq km |
| Area - comparative | slightly more than two times the size of Washington, DC | about 1.7 times the size of The Mall in Washington, DC |
| Background | These uninhabited, barren, sub-Antarctic islands were transferred from the UK to Australia in 1947. Populated by large numbers of seal and bird species, the islands have been designated a nature preserve. | First explored by the French in 1776, the island came under the jurisdiction of Reunion in 1814. At present, it serves as a sea turtle sanctuary and is the site of an important meteorological station. |
| Climate | antarctic | tropical |
| Coastline | 101.9 km | 3.7 km |
| Country name | conventional long form: Territory of Heard Island and McDonald Islands
conventional short form: Heard Island and McDonald Islands |
conventional long form: none
conventional short form: Tromelin Island local long form: none local short form: Ile Tromelin |
| Dependency status | territory of Australia; administered from Canberra by the Australian Antarctic Division of the Department of the Environment and Heritage | possession of France; administered by the Administrateur Superieur of the French Southern and Antarctic Lands |
| Diplomatic representation from the US | none (territory of Australia) | - |
| Diplomatic representation in the US | none (territory of Australia) | - |
| Disputes - international | none | claimed by Mauritius |
| Economy - overview | No indigenous economic activity, but the Australian Government allows limited fishing around the islands. | no economic activity |
| Elevation extremes | lowest point: Indian Ocean 0 m
highest point: Mawson Peak, on Big Ben 2,745 m |
lowest point: Indian Ocean 0 m
highest point: unnamed location 7 m |
| Environment - current issues | NA | NA |
| Flag description | the flag of Australia is used | the flag of France is used |
| Geographic coordinates | 53 06 S, 72 31 E | 15 52 S, 54 25 E |
| Geography - note | - | climatologically important location for forecasting cyclones; wildlife sanctuary (seabirds, tortoises) |
| Irrigated land | 0 sq km | 0 sq km (1998 est.) |
| Land boundaries | 0 km | 0 km |
| Land use | arable land: 0%
permanent crops: 0% other: 100% (2001) |
arable land: 0%
permanent crops: 0% other: 100% (grasses; scattered bushes) (2001) |
| Legal system | the laws of Australia, where applicable, apply | the laws of France, where applicable, apply |
| Location | islands in the Indian Ocean, about two-thirds of the way from Madagascar to Antarctica | Southern Africa, island in the Indian Ocean, east of Madagascar |
| Map references | Antarctic Region | Africa |
| Maritime claims | territorial sea: 12 nm
exclusive fishing zone: 200 nm |
territorial sea: 12 nm
exclusive economic zone: 200 nm continental shelf: 200-m depth or to the depth of exploitation |
| Military - note | defense is the responsibility of Australia; Australia conducts fisheries patrols | defense is the responsibility of France |
| Natural hazards | Mawson Peak, an active volcano, is on Heard Island | NA |
| Natural resources | fish | fish |
| Population | uninhabited (July 2005 est.) | uninhabited, except for visits by scientists (July 2005 est.) |
| Ports and harbors | none; offshore anchorage only | none; offshore anchorage only |
| Terrain | Heard Island - 80% ice-covered, bleak and mountainous, dominated by a large massif (Big Ben) and an active volcano (Mawson Peak); McDonald Islands - small and rocky | low, flat, and sandy; likely volcanic |