Santiago Island is one of the Galápagos Islands. The island, which consists of two overlapping volcanoes, has an area of 585 square kilometers (226 sq mi) and a maximum altitude of 907 meters (2,976 ft), atop the northwestern shield volcano. The volcano in the island's southeast erupted along a linear fissure and is much lower. The oldest lava flows on the island date back to 750,000 years ago.

Floreana Island is a southern island in Ecuador's Galápagos Archipelago. The island has an area of 173 km2 (67 sq mi). It was formed by volcanic eruption. The island's highest point is Cerro Pajas at 640 m (2,100 ft), which is also the highest point of the volcano like most of the smaller islands of Galápagos. The island has a population of about 100.