Fernandina Island is the youngest and third largest island in the Galapagos, as well as the furthest west. It has an area of 642 km² (248 sq mi) and a height of 1,476 m (4,843 ft), with a summit caldera about 6.5 km (4.0 mi) wide. It is younger than Isabela, being only less than one million years old since its formation. Like the other islands, it was formed by the Galápagos hotspot. The island is an active shield volcano that has most recently erupted in March 2024.