The Comoros Islands sit in the northern Mozambique Channel, roughly 300 kilometers from both the East African coast and Madagascar. This group of volcanic islands in the Indian Ocean is split between two political entities: three islands form the Union of the Comoros, a sovereign nation, while Mayotte belongs to France.\u00a0Together, the four principal islands \u2014 Ngazidja (Grande Comore), Ndzuwani (Anjouan), Mwali (Moh\u00e9li), and Mayotte (Maore) \u2014 cover a total area of about 2,034 km\u00b2.<\/p>\n\n\n\n
The archipelago owes its existence to millions of years of volcanic activity. Mayotte is the oldest island still above sea level and underwent three volcanic phases between 15 million and 500,000 years ago.\u00a0The ages progressively decrease from east to west, with Grande Comore being the youngest island and still volcanically active.\u00a0Its dominant feature, Mount Karthala, is an extremely active volcano and the highest point of the Comoros at 2,361 meters above sea level, erupting roughly every 10 to 20 years.\u00a0Four bird species are found only on Karthala’s slopes: the Grand Comoro drongo, Humblot’s flycatcher, the Karthala scops owl, and the Karthala white-eye.<\/p>\n\n\n\n
Moroni, the national capital, sits on Grande Comore’s western coast. Mayotte, which voted to retain French authority in the 1975 referendum, officially became France’s 101st department on 31 March 2011\u00a0\u2014 a status the Union of the Comoros and the African Union continue to contest. Nearby features like the Glorioso Islands and submerged reefs such as Banc Vailheu, Banc du Geyser, and Banc du Leven are geologically part of the same volcanic chain.<\/p>\n\n\n\n
The islands have a maritime tropical climate with a rainy season from November to April, when northerly winds bring moist, warm air averaging 25\u00b0C. From May to September, southerly winds bring cooler and drier conditions. Higher elevations receive over 5,000 mm of rain per year on some uplands, while the driest coastal areas get around 1,000 mm.\u00a0Cyclones, occurring during the hot and wet season, can cause extensive damage, especially in coastal areas; on average, at least twice each decade, houses, farms, and harbor facilities are devastated.<\/p>\n\n\n\n
Water availability varies sharply from island to island. Mayotte and Moh\u00e9li have perennial streams and lakes, including Dziani Karehani and Dziani Dzaha on Mayotte and the sulfurous Dziani Boundouni on Moh\u00e9li.\u00a0Grande Comore’s geologically young soil is thin and rocky and cannot hold water, so rainfall must be stored in catchment tanks.\u00a0No primary freshwater fish families \u2014 those intolerant of salt water \u2014 are native to the islands, on account of their oceanic origin and relatively recent geologic origins.<\/p>\n\n\n\n
The biological richness here is striking for such a small land area. Of approximately 1,000 native plant species, 30 percent are endemic to the Comoros, including the endangered palm Ravenea hildebrandtii.\u00a0Two bat species, Livingstone’s fruit bat and the Comoro rousette, are endemic; Livingstone’s fruit bat has been reduced to a population of about 1,200 specimens restricted to Anjouan and Moh\u00e9li.\u00a0Comorian waters also shelter the coelacanth, a rare fish whose fossil remains date back 400 million years and which was once thought to have gone extinct 70 million years ago.\u00a0The islands are sometimes called the “Perfume Islands” because Comoros produces approximately 80% of the world’s ylang-ylang essence.\u00a0But that same ylang-ylang industry, along with firewood demand and population pressure on densely settled Anjouan, has driven significant deforestation. Little intact forest now remains on Anjouan and Mayotte, and much of the remaining forest on Moh\u00e9li and Grande Comore is badly degraded except at higher elevations.<\/p>\n\n\n\n
Politically, the archipelago has been turbulent since independence in 1975. In 1997, demands for increased autonomy on Anjouan and Moh\u00e9li led to a breakup of the federal republic.\u00a0The standoff dragged on for years before federal forces reasserted control. Meanwhile, France’s continued administration of Mayotte remains a source of friction between Paris, the Union of the Comoros, and the African Union. These overlapping tensions \u2014 geological instability, ecological fragility, political division \u2014 define what makes the Comoro Archipelago one of the Indian Ocean’s most complex and overlooked regions.<\/p>\n\n\n\n