The Piton de la Fournaise is basaltic shield volcano on Reunion Island in the western Indian Ocean. It is one of the most active volcanoes on Earth. It was built on Piton des Neiges, an older extinct volcano that dates back 22,000 years. Piton de la Fournaise has erupted at least 153 times since 1640. About 600,000 people live on the 950 square mile (2,510 square kilometers) island. Piton de la Fournaise has been monitored by a modern volcano observatory since 1980. The volcano is 8,630 feet (2,631 m) tall and located at 21.2S, 55.7E.