A stratovolcano in the Zambales Mountains on the eastern coast of the island of Luzon in the Philippines. In the aftermath of its 1991 eruption, the global temperature briefly decreased by almost a full degree Fahrenheit due to the ejection of aerosols and sulfuric acid. That eruption was ten times more powerful than the 1980 eruption of Mount Saint Helens; it killed at least 800 people and forced the evacuation of some 20,000 people. In its aftermath, monsoon rains created Lake Pinatubo in the resulting crater. In 2010, the indigenous Aeta people were formally granted domain over the volcano.