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 South Atlantic Ocean, about midway between South America and Africa; Ascension Island lies 1,300 km (800 mi) northwest of Saint Helena; Tristan da Cunha lies 4,300 km (2,700 mi) southwest of Saint HelenaCIA World Factbook [2025] · 2026 archive
Coastline	Saint Helena: 60 km Ascension Island: NA Tristan da Cunha (island only): 34 kmCIA World Factbook [2025] · 2026 archive
Land boundaries	0 kmCIA World Factbook [2025] · 2026 archive
Bordering countries	No authoritative open source found
Terrain	the islands of this group are of volcanic origin associated with the Atlantic Mid-Ocean Ridge Saint Helena: rugged, volcanic; small scattered plateaus and plainsAscension: surface covered by lava flows and cinder cones of 44 dormant volcanoes; terrain rises to the eastTristan da Cunha: sheer cliffs line the coastline of the nearly circular island; the flanks of the central volcanic peak are deeply dissected; narrow coastal plain lies between The Peak and the coastal cliffsCIA World Factbook [2025] · 2026 archive
Climate	Saint Helena: tropical marine; mild, tempered by trade winds Ascension Island: tropical marine; mild, semi-arid Tristan da Cunha: temperate marine; mild, tempered by trade winds (tends to be cooler than Saint Helena)CIA World Factbook [2025] · 2026 archive
Natural resources	fish, lobsterCIA World Factbook [2025] · 2026 archive
Highest point	Queen Mary's Peak on Tristan da Cunha 2,060 m; Green Mountain on Ascension Island 859 m; Diana's Peak on Saint Helena Island 818 mCIA World Factbook [2025] · 2026 archive
Lowest point	Atlantic Ocean 0 mCIA World Factbook [2025] · 2026 archive
Mean elevation	No authoritative open source found
Area (comparative)	slightly more than twice the size of Washington, D.C.CIA World Factbook [2025] · 2026 archive
Natural hazards	active volcanismvolcanism: the volcanoes of Tristan da Cunha (2,060 m) and Nightingale Island (365 m) are activeCIA World Factbook [2025] · 2026 archive
Maritime claims	territorial sea: 12 nm; exclusive fishing zone: 200 nmCIA World Factbook [2025] · 2026 archive