Saint Helena Geography 2007

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

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: 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

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

Land boundaries:
0 km

Coastline:
Saint Helena: 60 km
Ascension Island: NA
Tristan da Cunha: 40 km

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 2,062 m; Green Mountain on Ascension Island 859 m; Mount Actaeon on Saint Helena Island 818 m

Natural resources:
fish, lobster

Land use:
arable land: 12.9%
permanent crops: 0%
other: 87.1% (2005)

Irrigated land:
NA

Natural hazards:
active volcanism on Tristan da Cunha, last eruption in 1961

Environment - current issues:
NA