links [ edit ]Geography The  region is divided into two geographical areas – 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