Mount Isarog is a potentially active stratovolcano located in the province of Camarines Sur, Philippines, on the island of Luzon. It has an elevation of 2,000 metres above mean sea level. The peak of the mountain marks the point where the borders of six municipalities meet (listed in clockwise direction, starting north): Goa, Tigaon, Ocampo, Pili, Naga, and Calabangaand Tinambac, Camarines Sur.
Mount Isarog was where local troops of the Philippine Army and Constabulary units and Bicolano guerrillas hid during the Japanese Period. In the 1970s, with the leadership of Romulo Jallores and his brother, they established the New People's Army in the Bicol region at the foot of this mountain.