Moroni, coastal town, capital, and largest settlement of Comoros, southwestern Grande Comore (also called Njazidja) island in the Indian Ocean. It was founded by Arabic-speaking settlers, possibly as early as the 10th century AD. Dzaoudzi, the principal city of the island of Mayotte, was the original administrative capital of Comoros, but Moroni succeeded it in 1958. The port of Moroni consists of a small quay in a natural cove and lacks natural protection for shipping. Vanilla, cacao, and coffee are exported from the port, whose facilities include warehouse storage for imports and exports and for petroleum products.