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Tristan da Cunha

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Christiana Hanaman
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« Reply #45 on: December 13, 2011, 12:41:01 am »

Terrain

Saint Helena has a rugged, volcanic terrain, with small scattered plateaus and plains, with the largest area of level ground on the island being Prosperous Bay Plain in the eastern arid area. The other islands of the group have a volcanic origin. The highest point on the island is Diana's Peak at 818 metres (2,684 ft), though Queen Mary's Peak on Tristan da Cunha is the highest in the British territory at 2,062 m.

A natural hazard on Tristan da Cunha is active volcanism, though this is not the case on St Helena itself.
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Christiana Hanaman
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« Reply #46 on: December 13, 2011, 12:41:21 am »

Geological Features

The Barn is a capping of younger lavas upon weaker rocks. The Barn features cliffs on the side that faces the sea. It overlooks the pyroclasts and weak flows of Turk's Cap Valley to the south.[1]

Taking their names from the story of Lot in the Book of Genesis, "Lot" and "Lot's Wife" are two solitary pillars of rock topping two valleys near Sandy Bay. The pillars are phonolitic intrusions, which are more resistant to erosion than surrounding volcanic features which have, in time, eroded away. [2]
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« Reply #47 on: December 13, 2011, 12:41:52 am »

Natural resources

Saint Helena possesses fish as a main natural resource. Land use in the island group is divided between arable land (with 12.9% of the area given to this) and other uses, which occupy the remaining 87.1%.

In terms of maritime claims, St Helena has an exclusive fishing zone of 200 nautical miles, and a territorial sea of twelve nautical miles.
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« Reply #48 on: December 13, 2011, 12:42:10 am »

Islands

Just off the coast of St Helena island itself are numerous small islands. Starting from the north and running clockwise, these are: Shore Island, George Island, Rough Rock Island, Flat Rock, The Buoys, Sandy Bay Island, Black Horse Island, White Bird Island, Frightus Island, Jar Rock, Castle Point Rock, Robert Rock, Salt Rock, Speery Island, Flat Rock, The Needle, Lower and Upper Black Rock, Bird Island, Black Rock, Thompson's Valley Island, Peaked Island, Egg Island, Lady's Chair, Lighter Rock, Long Ledge, and Red Rock.
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« Reply #49 on: December 13, 2011, 12:42:31 am »

Ecology


Saint Helena harbours at least 40 species of plants unknown anywhere else in the world, and Ascension is a breeding ground for sea turtles and sooty terns.
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« Reply #50 on: December 13, 2011, 12:43:46 am »



Sterna Vittata
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23 February 2009, 10:43
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Christiana Hanaman
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« Reply #51 on: December 13, 2011, 12:44:40 am »



Tourists arrive at Tristan da Cunha by boat
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23 February 2009, 08:59
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Christiana Hanaman
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« Reply #52 on: December 13, 2011, 12:46:00 am »



The harbour of Edinburgh of the Seven Seas, Tristan da Cunha
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23 February 2009, 12:36
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« Reply #53 on: December 13, 2011, 12:46:24 am »



Edinburgh of the Seven Seas, Tristan da Cunha, South Atlantic Ocean
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23 February 2009
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« Reply #54 on: December 13, 2011, 12:47:18 am »



Potato patches on Tristan da Cunha, South Atlantic Ocean
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23 February 2009, 14:51
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« Reply #55 on: December 13, 2011, 12:48:16 am »



Thalassarche chlororhynchos, Tristan da Cunha
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23 February 2009
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