Botolan is a municipality in the province of Zambales in the Philippines. The town was founded by Spanish Governor-General Juan de Salcedo in 1572. According to the 2015 census, it has a population of 57,707 people. Botolan has the largest land area of the municipalities in Zambales. Located just south of the provincial capital of Iba, Botolan is known for its larger Aeta population, wide gray sand beaches, and as the location of Mount Pinatubo. ^ "Region III ". Census of Population : Total Population by Province, City, Municipality and Barangay.