Guinayangan, officially the Municipality of Guinayangan, is a municipality in the province of Quezon, Philippines. According to the 2020 census…Guinayangan, officially the Municipality of Guinayangan, is a municipality in the province of Quezon, Philippines. According to the 2020 census, it has a population of 44,045 people. The municipality is home to the Maulawin Spring Protected Landscape and the critically endangered Inagta Lopez, a dialect of the critically endangered Inagta Alabat language, which has at most 30 speakers left in the world.