San Cristóbal (Chatham) is the easternmost island in the Galápagos archipelago, and one of the oldest geologically.
Its Spanish (and official Ecuadorian) name "San Cristóbal" comes from the patron saint of seafarers, St. Christopher. English speakers increasingly use that name in preference to the traditional English name of Chatham Island, derived from William Pitt, 1st Earl of Chatham.
San Cristóbal has an area of 558 km (215 sq mi) and its highest point rises to 730 metres (2,400 ft). The capital of the archipelago, Puerto Baquerizo Moreno, lies at the south-western tip of the island. Two airlines fly directly to San Cristóbal Airport from Guayaquil, Ecuador; flights from Quito stop for passengers in Guayaquil.
This island hosts frigate birds, Galapagos sea lions, Galápagos tortoises, blue and red footed boobies, tropical birds, marine iguanas,dolphins, swallow-tailed seagulls. Its vegetation includes Calandrinia galapagosa, Lecocarpus darwinii, trees such as Lignum vitae,Matazarna. In the waters nearby are sharks, rays, and lobsters.
The largest fresh water lake in the archipelago, Laguna El Junco, is located in a crater in the highlands of San Cristóbal, in the southern half of the island. The lake harbors a large population of birdlife, but reaching the lake requires a short uphill walk. Nearby, La Galapaguera is a breeding station and sanctuary for giant tortoises