It consists of an island in Lake Taal, which is situated within a caldera formed by an earlier, very powerful eruption. It is located about 50 km (31 Miles) from the capital, Manila.
It is one of the active volcanos in the Philippines, all part of the Pacific ring of fire.
The volcano has erupted violently several times, causing loss of life in the populated areas surrounding the lake, the current death toll standing at around 5,000 – 6,000. Because of its proximity to populated areas and eruptive history, the volcano has been designated a Decade Volcano worthy of close study to prevent future natural disasters. It was thought to be named as “a volcano inside a volcano” because many believed that the lake that circles the volcano was once a crater or mouth of a volcano.