Geography of Seychelles

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Map of Seychelles

The Seychelles is a small island nation located in the Indian Ocean northeast of Madagascar and about 1,600 km (994 mi) east of Kenya. Seychelles lies between approximately 4ºS and 10ºS and 46ºE and 54ºE. The nation is an archipelago of 155 tropical islands, some granite and some coral. the majority of which are small and uninhabited. The landmass is only 459 km², but the islands are spread over an Exclusive Economic Zone of 1,374,000 km². About 90 percent of the population of 90,000 live on Mahé, 9 percent on Praslin and La Digue. Around a third of the land area is the island of Mahé and a further third the atoll of Aldabra.

There are two distinct regions, the granitic islands, the world's only oceanic islands of granitic rock and the coralline outer islands. The granite islands are the world’s oldest ocean islands, while the outer islands are mainly very young, though the Aldabra group and St Pierre (Farquhar Group) are unusual, raised coral islands that have emerged and submerged several times during their long history, the most recent submergence dating from about 125,000 years ago.

Inner Islands[edit]

The Inner Islands is the collective term for 45 islands with a total area of 247.2 km², 54% of the Seychelles area but with more than 99% of the population.

The Granitic Group consists of 45 granite islands, all within a 56 km (35 mi) radius of the main island of Mahé. These islands are rocky, and most have a narrow coastal strip and a central range of hills rising as high as 914 metres (2,999 ft). The most important islands of this group are:

Two coralline islands, at 90 km to the north, make up the remainder of the Inner Islands:

Millions of years ago, the archipelago was created by a combination of the separation of India from Africa as well as undersea volcanoes similar to those from which Mauritius and Réunion were created. Subsequently the vast majority of this huge land area became submerged over time.

Outer Islands (also known as Zil Elwannyen Sesel)[edit]

The Outer Islands consist of five groups of coralline islands:

The Outer Islands comprise 211.3 km² (46% of the Seychelles), but less than 1% of the population.

The coral islands are flat with elevated coral reefs at different stages of formation. They have no fresh water and can sustain human life only with difficulty.

Geology[edit]

The Seychelles is part of the granitic Mascarene Plateau which broke off from the Indian Plate about 66 mya. This rift formation is associated with the Réunion hotspot which is also responsible for Réunion Island and the Deccan Traps in India. Because of its long isolation, the Seychelles hosts several unique species including the Coco de mer, a palm which has the largest seeds of any plant and the world's largest population of giant tortoises.

Climate[edit]

The climate is equable and healthy, although quite humid, as the islands are small and subject to marine influences. The temperature varies little throughout the year. Temperatures on Mahé vary from 24 to 30 °C (75.2 to 86.0 °F), and rainfall ranges from 2,900 mm (114.2 in) annually at Victoria to 3,600 mm (141.7 in) on the mountain slopes. Precipitation is somewhat less on the other islands. During the coolest months, July and August, it drops to as low as 24 °C (75.2 °F). The southeast trade winds blow regularly from May to November, and this is the most pleasant time of the year. The hot months are from December to April, with higher humidity (80%). March and April are the hottest months, but the temperature seldom exceeds 31 °C (87.8 °F). Most of the islands lie outside the cyclone belt, so high winds are rare.

Flora and fauna[edit]

The uniqueness of the Seychelles' ecology is reflected in the US$1.8 million project of the Global Environment Trust Fund of the World Bank (see Glossary) entitled Biodiversity Conservation and Marine Pollution Abatement, that began in 1993. The World Bank study for this project states that the islands contain, out of a total of 1,170 flowering plants, "at least 75 species of flowering plants, 15 of birds, 3 of mammals, 30 of reptiles and amphibians, and several hundred species of snails, insects, spiders and other invertebrates" found nowhere else. The diversity of species in the islands is being assessed by the Nature Protection Trust of Seychelles. In addition, the waters contain more than 1000 kinds of fish, of which more than one-third are associated with coral reefs. Specific examples of unique birds are the Black Paradise Flycatcher, the Black Parrot, the brush warbler, and a flightless rail. Most famous of all the Seychelles animals are the giant tortoises of the genus Aldabrachelys.

Environmental threats[edit]

As a result of extensive shipping to Seychelles that brings needed imports and the discharge of commercial tuna fishing, the waters suffer some pollution. Furthermore, goats brought to Aldabra Islands are destroying much of the vegetation on which giant tortoises feed or seek shade. Rats have reduced biodiversity on many islands. Climate change is also a significant issue; it was recently realised that this has caused the extinction of the endemic snail Rhachistia aldabrae.

Seychelles began addressing the conservation problem in the late 1960s by creating the Nature Conservancy Commission, later renamed the Seychelles National Environment Commission. A system of national parks and animal preserves covering 42% of the land area and about 260 km² of the surrounding water areas has been set aside. Legislation protects wildlife and bans various destructive practices. In Seychelles' 1990 to 1994 National Development Plan, an effort was made to include in the appropriate economic sectors of the development plan environment and natural resources management aspects.

Also connected with ecology is a World Bank project dealing with the environment and transportation. Launched in 1993 with a loan of US$4.5 million, it is designed to improve the infrastructure of Seychelles with regard to roads and airports or airstrips so as to encourage tourism as a source of income, while simultaneously supporting environmental programs in resource management, conservation, and the elimination of pollution.

Another major project has been funded by Fonds Francais pour l'environnement Mondiale (FFEM) and implemted by Island Conservation Society. This aims to rehabilitate and enhance islands for the maintenance of native biodiversity in Seychelles through eradication of introduced predator species, rehabilitation of habitats and reintroduction of rare or threatened species. Rats have been eliminated from North Island under this project and more schemes are planned, including at Cosmoledo Atoll and on Conception Island.

Facts and figures[edit]

Detailed map of Seychelles

Geographic coordinates: 4°35′S 55°40′E / 4.583°S 55.667°E / -4.583; 55.667

Area:
total: 459 km²
land: 459 km²
water: 0 km²

Land boundaries: 0 km

Coastline: 491 km

Maritime claims:
continental shelf: 200 nmi (370.4 km; 230.2 mi) or to the edge of the continental margin
exclusive economic zone: 200 nmi (370.4 km; 230.2 mi)
territorial sea: 12 nmi (22.2 km; 13.8 mi)

Elevation extremes:
lowest point: Indian Ocean 0 m
highest point: Morne Seychellois 905 m

Natural resources: fish, copra, cinnamon trees

Land use:
arable land: 2%
permanent crops: 13%
permanent pastures: 0%
forests and woodland: 11%
other: 74% (1993 est.)

Irrigated land: 0 km²

Environment - international agreements:
party to: Biodiversity, Climate Change, Desertification, Endangered Species, Hazardous Wastes, Law of the Sea, Marine Dumping, Nuclear Test Ban, Ozone Layer Protection, Ship Pollution, Whaling
signed, but not ratified: Climate Change-Kyoto Protocol


Table of Islands[edit]

Island Capital Other Cities Area (km²) Population
Inner Islands Victoria La Passe, Grand Anse 247.20 89521
Mahe Islands Victoria 163.20 78333
Anonyme Anonyme Anse pimen vert, 0.10 5
Cerf L’habitation kapok tree beach, west beach, turtle beach, south point, 1.27 100
Conception Anse Conception 0.6 0
Eden Eden Project 0.56 100
Aux Vaches 0.04 0
Long Anse Shangri-La Anse Prison 0.23 100
Mahé Victoria Cascade, Anse Royale, Anse Boileau, Beau Vallon 156.70 77983
Mamelles Mamelles 0.1 0
Moyenne Brendon Grimshaw Estate Anse Jolly Roger 0.09 1
Round Île Ronde 0.02 1
Sainte Anne Grand Anse Anse le mont fleuri, Anse Royal, Anse Tortue, Anse Manon, 2.19 40
Therese Anse Therese 0.74 3
Other Islands Romainville Ile Soleil 0.56 0
Praslin Islands Grand Anse Anse Volbert, St. Anne 42.20 7682
Aride Aride Village Robinson Crusoe beach, Turtle beach, 0.68 8
Chauve Souris Anse Chauve Souris 0.01 2
Cousin Anse Cousin 0.29 6
Cousine East beach west beach, North Beach 0.26 16
Curieuse Baie Laraie Anse St. Joseph, anse papao, grand anse, pointe rouge(red), anse badamer, pointe caimant, tortoise point, 2.86 7
Eve Eve Island Project 0.27 100
Praslin Grand Anse Anse Volbert, Baie St. Anne 37.56 7533
Round Anse Round Anse Chez Gaby 0.19 10
St. Pierre 0.01 0
Other Islands Booby Island 0.07 0
La Digue and Inner Islands La Passe 41.80 3506
Bird Bird Island Village birdwatchers beach 0.75 38
Denis St. Denis north end, anse boise d’argent, ance prince noir, 1.43 80
Felicite La Penice Ans Zil Pasyon, Grand Ans, 2.68 20
Fregate Fregate Marina Anse Lesange, Anse Bambous, 2.20 214
Iles Soeurs Grand Soeur Hotel Petite Soeur 1.18 2
La Digue La Passe anse patates, cap bayard, grande anse, roche bois, L’ Union, La Reunion 10.30 2800
Marianne Ans La Cour Pointe aux Joncs, Pointe Grand Glacis 0.97 0
North North Island Lodge East Beach, West Beach (or Grande Anse), Honeymoon Cove, Dive Beach 2.00 152
Silhouette La Passe Grand Barbe, 20.00 200
Other Islands Cocos Recife 0.29 0
Outer Islands (Coëtivy) Desroches, D'Arros, Alphonse 211.8 503
Aldabra Group Assumption west beach Picard Island station, Aldabra anse mais, Aldabra anse var, 178.24 12
Aldabra Picard Island station anse mais, anse var, 0. 0
Assumption Assumption west beach 0. 12
Cosmoledo 0. 0
Astove 0. 0
Other Islands 0. 0
Alphonse Group Anse d’Est Anse Sud 2.1 84
Alphonse Anse d’Est Anse Sud 0. 84
St. François 0. 0
Other Islands 0. 0
Amirante Group Desroches D'Arros, Poivre Nord, Remire (Eagle), Marie Louise 9.9 123
D'Arros The Estate north beach 1.5 42
Desroches south point village northeast point, Bombe Bay, 3.24 50
Poivre Poivre Nord Poivre Sud 2.48 10
Remire (Eagle) 0. 6
Marie Louise North west point village 0.53 15
Other Islands 2.15 0
Farquhar Group Farquhar Anse Franc Providence 11.6 21
Farquhar Anse Franc Vingt Cinq 8.00 15
Providence 0 6
Other Islands 3.6 0
Southern Coral Group Coëtivy Ile Platte 9.96 263
Coëtivy Coëtivy 0. 0
Platte Île Platte 0. 0
Other Islands 0. 0
Seychelles Victoria 459.0 90024


Extreme points[edit]

This is a list of the extreme points of Seychelles, the points that are farther north, south, east or west than any other location.

See also[edit]

External links[edit]

Notes[edit]

References[edit]