The Comoros is comprised of three main islands, Njazidja (or Ngazidja; also Grande Comore or Grand Comoros)—on which Moroni is located—Nzwani (or Ndzouani; also Anjouan), and Mwali (also Mohéli), and numerous coral reefs and islets. They are volcanic in origin, with interiors that vary from high peaks to low hills and coastlines that feature many sandy beaches. Njazidja is the site of an active volcano, Karthala, which, at 7,746 ft (2,361 m), is the islands' highest peak. The Comoros have a tropical climate with the year almost evenly divided between dry and rainy seasons; cyclones (hurricanes) are quite frequent. The islands once supported extensive rain forests, but most have been severely depleted.
The inhabitants are a mix mostly of African, Arab, Indian, and Malay ethnic strains. Sunni Muslims make up 98% of the population; there is a small Roman Catholic minority. Arabic and French are the official languages, and Comorian (or Shikomoro, a blend of Swahili and Arabic) is also spoken.