Cotabato City in the context of "Bangsamoro"

Mindanao (/ˌmɪndəˈnaʊ/ MIN-də-NOW) is the second-largest island in the Philippines, after Luzon, and seventh-most populous island in the world. Located in the southern region of the archipelago, the island is part of an island group of the same name that also includes its adjacent islands, notably the Sulu Archipelago. According to the 2020 census, Mindanao had a population of 26,252,442, while the entire island group had an estimated population of 27,384,138 as of 2024.

Mindanao is divided into six administrative regions: the Zamboanga Peninsula, Northern Mindanao, the Caraga region, the Davao region, Soccsksargen, and the autonomous region of Bangsamoro. According to the 2020 census, Davao City is the most populous city on the island, with 1,776,949 people, followed by Zamboanga City (pop. 977,234), General Santos (pop. 722,059), Butuan (pop. 372,910), and Cotabato City (pop. 325,079). About 70% of residents identify as Christian and 24% as Muslim. Mindanao is considered the major Bread Basket of the Philippines.

The Autonomous Region in Muslim Mindanao (Filipino: Rehiyong Awtonomo ng Muslim Mindanao; Arabic: الحكم الذاتي الاقليمي لمسلمي مندناو Al-ḥukm adh-dhātī al-'iqlīmī li-muslimī Mindanāu; ARMM) was an autonomous region of the Philippines, located in the Mindanao island group of the Philippines, that consisted of five predominantly Muslim provinces: Basilan (except Isabela City), Lanao del Sur, Maguindanao, Sulu, and Tawi-Tawi. It was the only region that had its own government. The region's de facto seat of government was Cotabato City, although this self-governing city was outside its jurisdiction.

The ARMM included the province of Shariff Kabunsuan from its creation in 2006 until July 16, 2008, when Shariff Kabunsuan ceased to exist as a province after the Supreme Court of the Philippines declared the "Muslim Mindanao Autonomy Act 201", which created it, unconstitutional in Sema v. COMELEC and Dilangalen.

The 2019 Bangsamoro autonomy plebiscite was a two-part plebiscite held in Mindanao, Philippines, that ratified the Bangsamoro Organic Law (BOL) and replaced the Autonomous Region in Muslim Mindanao (ARMM) with the Bangsamoro Autonomous Region in Muslim Mindanao (BARMM), as well as the scope of the said region.

Under the organic law, the government would have to hold the plebiscite not more than 150 days from the signing of the BOL into law (July 26, 2018) but not earlier than 90 days from the law's signing. The first part of the plebiscite was held on January 21, 2019, where voters from the ARMM voted regarding the BOL's ratification and residents of Cotabato City and Isabela City voted for or against their cities' inclusion into the then-proposed region. The second part was held on February 6 to potentially expand the BARMM; with voters from six municipalities in Lanao del Norte and 67 barangays in Cotabato province voting for or against their localities' inclusion into the BARMM.