Santiago Island is an island of the Galápagos Islands. It is also known as San Salvador, named after the first island discovered by Columbus in the Caribbean Sea (see San Salvador Island), or as James Island. The island, which consists of two overlapping volcanoes, has an area of 585 km² and a maximum altitude of 907 meters, atop the northwestern shield volcano. The volcano in the island’s southwest erupted along a linear fissure, and is much lower. The oldest lava flows on the island date back to 750,000 years ago.
Marine Iguanas, sea lions, fur seals, land and sea turtles, flamingos, dolphins, and sharks are found here. There are a large number of goats and pigs, animals which were introduced by humans to the islands and have caused great harm to the endemic species. Darwin Finches and Galápagos Hawks are usually seen as well as a colony of Fur Seals. At Sullivan Bay, a recent (1897) pahoehoe lava flow can be observed.