The Autonomous Region in Muslim Mindanao an Autonomous region of the Philippines, situated in the Mindanao island gathering of the Philippines, that involves five dominatingly Muslim areas: Basilan (aside from Isabela City), Lanao del Sur, Maguindanao, Sulu and Tawi-Tawi. It is the main area that has its own particular government. The locale's accepted seat of government is Cotabato City, in spite of the fact that this self-administering city is outside of its ward. The ARMM traverses two geological territories: Lanao del Sur and Maguindanao (aside from Cotabato City) in south western Mindanao, and the island areas of Basilan (with the exception of Isabela City), Sulu and Tawi-Tawi in the Sulu Archipelago. The area covers an aggregate of 12,288 km².