Dzaoudzi (Mayotte) is a French territorial collectivity, in the Comoro chain of the Indian Ocean. Dzaoudzi is the capital and Mamoudzou is the largest city. The land is gently rolling, with some mountains of ancient volcanic origin and deep ravines. The climate is tropical, with a hot and humid rainy season and a cooler dry season. Nearly all Muslim, the population is of mixed Arab, African, and Malagasy origin. Mahorian, a Swahili dialect, and French are both spoken. Much of its food is imported, mainly from France. It became a French possession in 1843.