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Saint Helena, Ascension, and Tristan da Cunha Geography 2015

SOURCE: 2015 CIA WORLD FACTBOOK AND OTHER SOURCES











Saint Helena, Ascension, and Tristan da Cunha Geography 2015
SOURCE: 2015 CIA WORLD FACTBOOK AND OTHER SOURCES


Page last updated on June 18, 2014

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 Helena

Geographic 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

Map references:
Africa

Area:
total: 308 sq km
country comparison to the world: 209
land: Saint Helena Island 122 sq km; Ascension Island 88 sq km; Tristan da Cunha island group 98 sq km
water: 0 sq km

Area - comparative:
slightly more than twice the size of Washington, DC

Land boundaries: 0 km
[see also: Land boundaries country ranks ]

Coastline:

Saint Helena: 60 km
Ascension Island: NA
Tristan da Cunha: 40 km
[see also: Coastline country ranks ]

Maritime claims:
territorial sea: 12 nm
exclusive fishing zone: 200 nm

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)

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

Elevation extremes:
lowest point: Atlantic Ocean 0 m
highest point: Queen Mary's Peak on Tristan da Cunha 2,060 m; Green Mountain on Ascension Island 859 m; Mount Actaeon on Saint Helena Island 818 m

Natural resources:
fish, lobster

Land use:
arable land: 10.26%
permanent crops: 0%
other: 89.74% (2011)

Irrigated land:
NA
[see also: Irrigated land country ranks ]

Natural hazards:
active volcanism on Tristan da Cunha
volcanism: the island volcanoes of Tristan da Cunha (elev. 2,060 m) and Nightingale Island (elev. 365 m) experience volcanic activity; Tristan da Cunha erupted in 1962 and Nightingale in 2004

Environment - current issues:
NA

Geography - note:
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


NOTE: 1) The information regarding Saint Helena, Ascension, and Tristan da Cunha on this page is re-published from the 2015 World Fact Book of the United States Central Intelligence Agency. No claims are made regarding the accuracy of Saint Helena, Ascension, and Tristan da Cunha Geography 2015 information contained here. All suggestions for corrections of any errors about Saint Helena, Ascension, and Tristan da Cunha Geography 2015 should be addressed to the CIA.
2) The rank that you see is the CIA reported rank, which may habe the following issues:
  a) They assign increasing rank number, alphabetically for countries with the same value of the ranked item, whereas we assign them the same rank.
  b) The CIA sometimes assignes counterintuitive ranks. For example, it assigns unemployment rates in increasing order, whereas we rank them in decreasing order






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