Matanao, officially the Municipality of Matanao, is a 2nd class municipality in the province of Davao del Sur, Philippines. At the 2020 census it h…Matanao, officially the Municipality of Matanao, is a 2nd class municipality in the province of Davao del Sur, Philippines. At the 2020 census it had a population of 60,493 people. It is situated on the island of Mindanao, the second-largest and southernmost major island in the Philippines.