Saint Helena, Ascension and Tristan da Cunha

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)

the islands of this group are of volcanic origin 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; terrain 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

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 Helena

Saint Helena: 60 km Ascension Island: NA Tristan da Cunha (island only): 34 km

0 sq km (2022)

Africa

active volcanism volcanism: the volcanoes of Tristan da Cunha (2,060 m) and Nightingale Island (365 m) are active

Saint Helena harbors at least 40 species of plants unknown elsewhere 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

fish, lobster

slightly more than twice the size of Washington, D.C.

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

Saint Helena: population is concentrated in and around the capital of Jamestown in the northwest, with another significant cluster in the interior Longwood area Ascension: most of the population lives in and around Georgetown Tristan da Cunha: most of the nearly 300 inhabitants live in the northern coastal town of Edinburgh of the Seven Seas