Besao, officially the Municipality of Besao is a municipality in the province of Mountain Province, Philippines. According to the 2020 census, it h…Besao, officially the Municipality of Besao is a municipality in the province of Mountain Province, Philippines. According to the 2020 census, it has a population of 6,873 people.. Besao is 27 kilometres from Bontoc and 403 kilometres from Manila.