As of 2018, the Philippines has 24[1] volcanoes listed as active by the Philippine Institute of Volcanology and Seismology (PHIVOLCS). Twenty-one of these have had historical eruptions. The three exceptions are Cabalian, which is a strongly fumarolic volcano;[further explanation needed] Leonard Kniaseff, which was active 1,800 years ago (C14),[2] and Isarog, which last erupted around 3500 BCE and 2374 BCE ± 87 based on radiocarbon dating[3][4][5]
Volcanoes in the country have erupted within the last 600 years, with accounts of these eruptions documented by humans; or have erupted within the last 10,000 years (Holocene). There are 100 volcanoes in the Philippines listed by the Smithsonian Institution's Global Volcanism Program (GVP) at present,[6] of which 20 are categorized as "historical" and 59 as "Holocene".[6] The GVP lists volcanoes with historical, Holocene eruptions, or possibly older if strong signs of volcanism are still evident through thermal features like fumaroles, hot springs, mud pots, etc.[7]