Marantao, officially the Municipality of Marantao, is a 2nd class municipality in the province of Lanao del Sur, Philippines. According t…Marantao, officially the Municipality of Marantao, is a 2nd class municipality in the province of Lanao del Sur, Philippines. According to the 2020 census, it has a population of 37,763 people. Marantao is a Malay word that means "to go on adventure, travel or hunting or even on a war expedition".