General information

Ascension is the most northerly component of the territory of Saint Helena, Ascension and Tristan da Cunha, and it is dominated by a volcanic island of almost 90 km2 . This said, it has a vast exclusive economic zone that extends over more than 445,000 km2. It sits in the South Atlantic, around 1,125 km northwest of St Helena, and 1,600 km and 2,300 km from the coasts of Africa and South America, respectively. Around 800 people live on Ascension; however, there is no permanent population as the British government has established a policy of no right of abode, which means that only people who are working or are accompanying those who are working can remain for extended periods.

Ascension Island is thought to have been discovered in 1501 by a Portuguese explorer, at which point it was daubed Conception Island. Soon after, though, it was rediscovered on Ascension day of 1503 by another Portuguese explorer and renamed Ilha da Ascensão. Settlement of Ascension commenced in 1815, with the British establishing a garrison on the island in order to stop it being used as a base to liberate Napoleon Bonaparte from St Helena. Since then, it has served various purposes. For instance, it was an important naval and air station during World War II, particularly during the long Battle of the Atlantic (1939-1945), and was a valuable staging point during the Falklands War (1982). Nowadays, it hosts a Royal Air Force Station, a European Space Agency rocket tracking station, and a British-American signals intelligence facility. Plus, the British Broadcasting Corporation (BBC) have the Atlantic Relay Station.

Governance & Economy

Ascension forms part of the territory of Saint Helena, Ascension and Tristan da Cunha, and, as per the St Helena, Ascension and Tristan da Cunha Constitution Order 2009, each constitutes an equal part of the territory and has their own government. Prior to this order, all three were still in the same territory, but Ascension and Tristan da Cunha were dependencies of St Helena. This order also led to the establishment of the position of the Governor of Ascension Island, and the arrangement that the Governor of St Helena would be the ex officio Governor of Ascension Island. Nevertheless, given the distance between St Helena and Ascension, many functions are carried out by the Administrator of Ascension Island, and the wider Ascension Island Council. In practice, it is this Administrator who heads and manages the Ascension Island Government. In terms of legislation, Ascension Island has its own system of laws, much of which is based on that of St Helena, albeit with modifications to suit local circumstances.

The economy of Ascension Island is dominated by activities at the Wideawake Airfield, which is jointly operated by the Royal Air Force and the United States Space Force, and the Atlantic Relay Station of the BBC World Service. The island profits from the various communications activities that are carried out on it, and, increasingly, from tourism, as the islands have become more and more accessible. Plus, Ascension generates income through the sale of fishing licences, as well as of stamps and coins.


Ascension Island has a smattering of different conditions; many areas are wastelands of lava flows and cinder cones that support only highly resistant plants. Such places are indeed in keeping with Darwin’s description of Ascension as a desolate island, which he made following the visit of the second Beagle voyage in 1836. In other areas, though, there is grassland, scrubland, and woodland, including, incredibly, lush cloud forest.

Yet, somewhat sadly, Ascension hosts one of the most invaded terrestrial ecosystems in the world, with more than 95% of the plant species considered to be non-native. This exceedingly high level of non-nativeness is largely down to botanist Sir Joseph Dalton Hooker, who, with a lot of encouragement from Darwin, advised the Royal Navy and Kew Gardens to plant huge swathes of non-native vegetation. The reasoning was that it would capture more rainwater and improve the soil, and thereby transform Ascension into a luscious garden. So, starting in the mid-19th century, trees were brought from across the world and planted on the island. After a couple of decades, an array of non-native vegetation, including pines, bamboo, and eucalyptus, grew on Ascension. An artificial cloud forest even developed in the area that is now aptly known as Green Mountain.

This programme, predictably, placed a mighty strain on Ascension’s native flora and fauna. Some Ascension endemics cling on, like the Critically Endangered fern, Pteris adscensionis, and the Vulnerable fern, Asplenium ascensionis. Interestingly, this latter fern was thought to be extinct, until a handful were found in 2010. They have since been successfully propagated and the future of the species looks promising. Also, native flora and fauna are actively conserved in Ascension’s oldest national park, Green Mountain National Park.

In terms of fauna, Ascension is one of the most important nesting areas for tropical seabirds in the whole of the Atlantic; hence its designation as an Important Bird Area. It supports around half a million pairs of over 10 breeding species, including the endemic and Vulnerable Ascension frigatebird, and swathes of boobies, noddies, petrels, terns, and tropicbirds. The island was also once home to the endemic Ascension crake, but it was driven to extinction by invasive rats in the 18th century, or, if it survived long enough, by both rats and cats in the 19th century.

What’s more, Ascension is an important site for turtles. Its beaches support the second largest number of nesting green turtles in the Atlantic – in fact, its three main beaches for these Endangered turtles support more than half of all nesting green turtles in the whole of the South Atlantic. Notably, Ascension’s nesting turtles experienced sharp declines in the 19th and 20th centuries as they were hunted for their meat. But, once this practice was stopped in the mid-20th century, their numbers shot up six-fold. Additionally, Ascension’s waters boast high abundance of various fish, including tuna, billfish, and sharks, as well as just over 10 endemics.

However, as touched upon, Ascension’s biodiversity faces pressing threats from invasive species. The Mexican thorn, for instance, is particularly aggressive in its establishment of thickets that suppress native flora and provide sustenance for invasive rats. On that note, Ascension remains plagued by invasive rats, which affect the breeding birds and turtles. In the past, invasive cats had a devastating impact on the breeding seabirds of Ascension. In fact, their presence led to the loss of many seabirds from the main island. Yet, following the eradication of cats in 2004, several seabird species have returned and, in general, their numbers on Ascension have been rising.

Biodiversity conservation efforts on Ascension are often spearheaded by the Conservation and Fisheries Directorate of the Ascension Island Government, and supported by a raft of overseas organisations, like the Royal Society for the Protection of Birds. One particularly impressive conservation initiative in the territory is the Ascension Island Marine Protected Area. For context, in 2016, the UK Government announced that a huge area around Ascension Island would become a marine reserve, and, then, in 2019, the Ascension Island Government announced that all of its exclusive economic zone would be a marine protected area. This equates to more than 445,000 km2, making the protected area one of the largest in the world.




Georgetown (capital)

Ascension – wildlife and heritage

Ascension flag

Key Facts

> Human Population: c.800 (temporary) and 0 (permanent).

> Currency: Saint Helena Pound.

> Capital: Georgetown, named after King George III, the reigning King when Ascension Island was claimed and garrisoned in 1815.

> Administration: Ascension Island Government, with key roles being the Governor of St Helena who acts as the Governor of Ascension Island, and the Administrator of Ascension Island. A key advisory body is the Ascension Island Council (

> Overarching Website: