the  Mindanao mainland and the  Sulu Archipelago .  Lanao del Sur ,  Maguindanao and  Shariff Kabunsuan are situated in the  Mindanao mainland, while  Basilan ,  Sulu and  Tawi-Tawi are located within the  Sulu Archipelago . ARMM covers a total of 12,288 km². [6] [ edit ]Demographics [ edit ]Political Divisions [