On Santiago Island's eastern coast sits Bahia Sullivan. Take a walk along pahoehoe lava, which was created by an eruption that occurred here in 1897. With some luck, you might see some marine iguanas, Sally Lightfoot crabs, sea lions, finches, turtles, sharks and penguins. During your walk, as always, your naturalist guide will take you through the geological history of the island. Then, travel to Cerro Dragon (Dragon Hill) – one of the best places to see land iguanas. Walk to a brackish lagoon to see lagoon birds such as stilts, pintail ducks, sandpipers, sanderlings and flamingos. Further inland, the trail offers a beautiful view of the bay and the western area of the archipelago. This area is a nesting site for land iguanas, which is constantly monitored and assisted by the Charles Darwin Research Station. The arid-zone vegetation makes for an ideal place to see Darwin's finches, Galapagos mockingbirds, the endemic Galapagos flycatcher and yellow warblers.