The Pitons are two mountainous volcanic plugs, volcanic spires, located in Saint Lucia. Petit Piton is 743 m (2,438 ft) high and Gros Piton is 798.25 m (2,618.9 ft) high; they are linked by the Piton Mitan ridge. Piton means mountain peak in French, so Petit and Gros Piton respectively refer to the smaller and larger peak. The Pitons are a World Heritage Site, 2,909 ha (7,190 acres) in size, and located near the town of Soufrière.
A volcanic plug, also called a volcanic neck or lava neck, is a volcanic object created when magma hardens within a vent on an active volcano. When present, a plug can cause an extreme build-up of high gas pressure if rising volatile-charged magma is trapped beneath it, and this can sometimes lead to an explosive eruption. In a plinian eruption the plug is destroyed and ash is ejected.
Glacial erosion can lead to exposure of the plug on one side, while a long slope of material remains on the opposite side. Such landforms are called crag and tail. If a plug is preserved, erosion may remove the surrounding rock while the erosion-resistant plug remains, producing a distinctive upstanding landform.