| Location |
islands in the South Atlantic Ocean, about midway between South America and Africa; Ascension Island lies 700 nm northwest of Saint Helena; Tristan da Cunha lies 2300 nm southwest of Saint Helena |
| Grography |
Saint Helena harbors at least 40 species of plants unknown anywhere else in the world; Ascension is a breeding ground for sea turtles and sooty terns; Queen Mary's Peak on Tristan da Cunha is the highest island mountain in the South Atlantic and a prominent landmark on the sea lanes around southern Africa |
| Coordinates |
Saint Helena: 15 57 S, 5 42 W Ascension Island: 7 57 S, 14 22 W Tristan da Cunha island group: 37 15 S, 12 30 W |
| Area |
total: 413 sq km land: Saint Helena Island 122 sq km; Ascension Island 90 sq km; Tristan da Cunha island group 201 sq km water: 0 sq km |
| Terrain |
the islands of this group result from volcanic activity associated with the Atlantic Mid-Ocean Ridge Saint Helena: rugged, volcanic; small scattered plateaus and plains Ascension: surface covered by lava flows and cinder cones of 44 dormant volcanoes; ground rises to the east Tristan 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 cliffs |
| Natural Hazards |
active volcanism on Tristan da Cunha, last eruption in 1961 |
