Coastline: 60 km
Maritime claims: exclusive fishing zone: 200 NM territorial sea: 12 NM
Climate: Saint Helena - tropical; marine; mild, tempered by trade winds; Tristan da Cunha - temperate; marine, mild, tempered by trade winds (tends to be cooler than Saint Helena)
Terrain: Saint Helena - rugged, volcanic; small scattered plateaus and plains note: Elevation extremes: lowest point: Atlantic Ocean 0 m highest point: Queen Mary's Peak on Tristan da Cunha 2,060 m
Natural resources: fish
Land use: arable land: 13% permanent crops: 0% other: 87% (1998 est.)
Irrigated land: NA sq km
Natural hazards: active volcanism on Tristan da Cunha
Environment - current issues: NA
Geography - note: harbors at least 40 species of plants unknown anywhere else in the world; Ascension is a breeding ground for sea turtles and sooty terns