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Bulusan is classified by volcanologists as a stratovolcano (or a composite cone) and covers the northeast rim of Irosin caldera that was formed about 40,000 years ago. It has a peak elevation of 1,565 m (5,135 ft) above sea level with a base diameter of 15 km (9.3 mi).
The Sierra Madre is the longest mountain range in the Philippines.Spanning over 540 kilometers (340 mi), it runs from the province of Cagayan down to the province of Quezon in a north-south direction on the eastern portion of Luzon, the largest island of the archipelago.