Indicator	Value
Total area	No authoritative open source found
Exclusive economic zone (EEZ)	No authoritative open source found
Administrative divisions (ADM1)	No authoritative open source found
Location	islands in the Indian Ocean, about two-thirds of the way from Madagascar to AntarcticaCIA World Factbook [2025] · 2026 archive
Coastline	101.9 kmCIA World Factbook [2025] · 2026 archive
Land boundaries	0 kmCIA World Factbook [2025] · 2026 archive
Bordering countries	No authoritative open source found
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 rockyCIA World Factbook [2025] · 2026 archive
Climate	antarcticCIA World Factbook [2025] · 2026 archive
Natural resources	fishCIA World Factbook [2025] · 2026 archive
Highest point	Mawson Peak on Big Ben volcano 2,745 mCIA World Factbook [2025] · 2026 archive
Lowest point	Indian Ocean 0 mCIA World Factbook [2025] · 2026 archive
Mean elevation	No authoritative open source found
Area (comparative)	slightly more than two times the size of Washington, D.C.CIA World Factbook [2025] · 2026 archive
Natural hazards	Mawson Peak, an active volcano, is on Heard IslandCIA World Factbook [2025] · 2026 archive
Maritime claims	territorial sea: 12 nm; exclusive fishing zone: 200 nmCIA World Factbook [2025] · 2026 archive