San Marcelino

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San Marcelino (Ilocano:Ili ti San Marcelino; Tagalog:Bayan ng San Marcelino) is a first class municipality in the province of Zambales, Philippines. According to the 2010 census, it has a population of 31,879 people.
The municipality is home to Mapanuepe Lake that formed after the 1991 eruption of Mount Pinatubo.