| Tromelin Island (2002) | Heard Island and McDonald Islands (2004) | |
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| Airports | 1 (2001) | - | 
| Airports - with unpaved runways | total: 1 
 under 914 m: 1 (2002)  | 
				- | 
| Area | total: 1 sq km 
 land: 1 sq km water: 0 sq km  | 
				total: 412 sq km 
 land: 412 sq km water: 0 sq km  | 
				
| Area - comparative | about 1.7 times the size of The Mall in Washington, DC | slightly more than two times the size of Washington, DC | 
| Background | 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. | 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. | 
| Climate | tropical | antarctic | 
| Coastline | 3.7 km | 101.9 km | 
| Country name | conventional long form: none 
 conventional short form: Tromelin Island local long form: none local short form: Ile Tromelin  | 
				conventional long form: Territory of Heard Island and McDonald Islands 
 conventional short form: Heard Island and McDonald Islands  | 
				
| Dependency status | possession of France; administered by a high commissioner of the Republic, resident in Reunion | territory of Australia; administered from Canberra by the Australian Antarctic Division of the Department of the Environment and Heritage | 
| Diplomatic representation from the US | - | none (territory of Australia) | 
| Diplomatic representation in the US | - | none (territory of Australia) | 
| Disputes - international | claimed by Madagascar and Mauritius | none | 
| Economy - overview | no economic activity | No indigenous economic activity, but the Australian Government allows limited fishing around the islands. | 
| Elevation extremes | lowest point: Indian Ocean 0 m 
 highest point: unnamed location 7 m  | 
				lowest point: Indian Ocean 0 m 
 highest point: Mawson Peak, on Big Ben 2,745 m  | 
				
| Environment - current issues | NA | NA | 
| Flag description | the flag of France is used | the flag of Australia is used | 
| Geographic coordinates | 15 52 S, 54 25 E | 53 06 S, 72 31 E | 
| Geography - note | climatologically important location for forecasting cyclones; wildlife sanctuary (seabirds, tortoises) | - | 
| Irrigated land | 0 sq km (1998 est.) | 0 sq km (1998 est.) | 
| Land boundaries | 0 km | 0 km | 
| Land use | arable land: 0% 
 permanent crops: 0% other: 100% (grasses; scattered bushes) (1998 est.)  | 
				arable land: 0% 
 permanent crops: 0% other: 100% (2001)  | 
				
| Legal system | the laws of France, where applicable, apply | the laws of Australia, where applicable, apply | 
| Location | Southern Africa, island in the Indian Ocean, east of Madagascar | islands in the Indian Ocean, about two-thirds of the way from Madagascar to Antarctica | 
| Map references | Africa | Antarctic Region | 
| Maritime claims | continental shelf: 200-m depth or to the depth of exploitation 
 exclusive economic zone: 200 NM territorial sea: 12 NM  | 
				territorial sea: 12 nm 
 exclusive fishing zone: 200 nm  | 
				
| Military - note | defense is the responsibility of France | defense is the responsibility of Australia; Australia conducts fisheries patrols | 
| Natural hazards | NA | Mawson Peak, an active volcano, is on Heard Island | 
| Natural resources | fish | fish | 
| Population | uninhabited, except for visits by scientists (July 2002 est.) | uninhabited (July 2004 est.) | 
| Ports and harbors | none; offshore anchorage only | none; offshore anchorage only | 
| Terrain | low, flat, and sandy; likely volcanic | 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 | 
| Waterways | none | - |