The Union of the Comoros comprises three islands in the Mozambique Channel between Africa and Madagascar: Grande Comore (Ngazidja), Mohéli (Mwali), and Anjouan (Nzwani). A fourth island, Mayotte, remains French territory despite Comorian claims. The archipelago formed through volcanic activity, with Mount Karthala on Grande Comore remaining one of the world's most active volcanoes at 2,361 meters. Karthala erupted most recently in 2005 and 2006, with the summit crater containing one of the largest active volcanic calderas globally at approximately 3 by 4 kilometers. The islands sit roughly 300 kilometers off the East African coast and 300 kilometers northwest of Madagascar. Moroni serves as the national capital on Grande Comore, while Mutsamudu functions as Anjouan's main city and Fomboni as Mohéli's administrative center.
Comorian society speaks Shikomori, an island-specific Bantu language with four distinct dialects: Shingazidja on Grande Comore, Shindzwani on Anjouan, Shimwali on Mohéli, and Shimaore on Mayotte. Each island's dialect differs enough that speakers sometimes struggle with cross-comprehension. Arabic holds official status as the liturgical language, reflecting the population's nearly universal Sunni Islam adherence, which arrived through Persian and Arab traders between the 8th and 10th centuries. French remains the third official language, a colonial remnant used in government and formal education. The linguistic landscape reflects centuries of Indian Ocean trade networks connecting East Africa, Arabia, Persia, and the Swahili coast. Most Comorians trace mixed ancestry combining Bantu peoples, Arabs, Malagasy, Persians, and smaller populations of Indian and European descent. This genetic and cultural amalgamation occurred across approximately twelve centuries of maritime commerce.
Archeological evidence places human settlement in the Comoros by the 6th century CE, though likely earlier. Shirazi Persians established settlements and introduced Islam by the 10th century, creating a network of sultanates on each island. These sultanates traded slaves, tortoiseshell, ambergris, and later cloves and ylang-ylang essence throughout the Indian Ocean world. Anjouan and Grande Comore developed the most powerful sultanates, frequently warring over tribute and trade routes. Sultan Said Ali bin Said Omar ruled Grande Comore in the late 19th century when France established protectorate status over the islands in 1886, formalizing full colonial control by 1912. The French governed the Comoros from Madagascar until 1946, when the islands became a separate overseas territory. France granted internal autonomy in 1961, but retained control over foreign relations, defense, and currency.
The Comoros declared independence on July 6, 1975, after a referendum where three islands voted to separate from France while Mayotte voted to remain French. Said Mohamed Cheikh became the first president but governed only one month before Ahmed Abdallah seized power in August 1975. Three years later, Bob Denard, a French mercenary, led a coup reinstalling Abdallah as president in May 1978. Denard commanded the Presidential Guard and effectively controlled Comorian politics until 1989, when Abdallah died under circumstances widely attributed to Denard's forces. French military intervention removed Denard in December 1989. Between 1975 and 2008, the Comoros experienced more than twenty coup attempts or successful coups, making it one of the world's most politically unstable states during this period. Anjouan attempted secession in 1997, declaring independence and refusing reunion despite African Union mediation. The separatist crisis continued until March 2008, when Comorian forces backed by African Union troops retook the island.
The Comorian constitution, revised substantially in 2001 and 2009, attempts to balance power among the three islands through a rotating presidency. Each island elects a president who serves as the national president for one term, with the other two island presidents serving as vice presidents. This system aims to prevent the inter-island tensions that fueled the Anjouan crisis. The national government functions weakly, with limited ability to collect taxes or enforce laws across the islands. Grande Comore holds demographic dominance with approximately 300,000 of the nation's 870,000 people as of recent estimates, while Anjouan contains roughly 330,000 and Mohéli about 50,000. Population density on Anjouan reaches approximately 470 people per square kilometer, creating pressure on agricultural land and driving illegal emigration to Mayotte. Thousands of Comorians have drowned attempting the sea crossing to Mayotte in overloaded fishing boats.