Situated in the Pacific Ocean some 1,000 km from continental Ecuador, these 19 islands (Archipiélago de Colón) and the surrounding marine reserve have been called a unique 'living museum and showcase of evolution.' Located at the confluence of three ocean currents, the Galápagos are a 'melting pot' of marine species.
The Galápagos archipelago is located about 1,000 km (600 miles) from continental Ecuador and is composed of 127 islands, islets and rocks, of which 19 are large and 4 are inhabited. The Galápagos Islands and their surrounding waters form the Galápagos Province of Ecuador, the Galápagos National Park, the Galápagos Marine Reserve, and the Archipiélago de Colón (Galápagos) Biosphere Reserve.
This archipelago and its immense marine reserve is known as the unique ‘living museum and showcase of evolution’. Its geographical location at the confluence of three ocean currents makes it one of the richest marine ecosystems in the world.
Ongoing seismic and volcanic activity reflects the processes that formed the islands. These processes, together with the extreme isolation of the islands, led to the development of unusual plant and animal life – such as marine iguanas, flightless cormorants, giant tortoises, huge cacti, endemic trees and the many different subspecies of mockingbirds and finches – all of which inspired Charles Darwin’s theory of evolution by natural selection following his visit in 1835.
The Galápagos Marine Reserve is an underwater wildlife spectacle with abundant life ranging from corals to sharks to penguins to marine mammals. No other site in the world can offer the experience of diving with such a diversity of marine life forms that are so familiar with human beings, that they accompany divers.
The archipelago´s geology begins at the sea floor and emerges above sea level where biological processes continue. Three major tectonic plates—Nazca, Cocos and Pacific— meet at the basis of the ocean, which is of significant geological interest.
The larger islands typically comprise one or more gently sloping shield volcanoes, culminating in craters or calderas and the terrain are generally composed of uplifted marine lava flows.
In comparison with most oceanic archipelagos, the Galápagos are very young with the largest and youngest islands, Isabela and Fernandina, with less than one million years of existence, and the oldest islands, Española and San Cristóbal, somewhere between three to five million years.
On-going geological and geomorphological processes, including recent volcanic eruptions, small seismic movements, and erosion provide key insights to the puzzle of the origin of the Galapagos Islands. Almost no other site in the world offers protection of such a complete continuum of geological and geomorphological features.
More than 250 species are non-native introductions occurring predominantly around human settlements. Coastal vegetation, influenced by the presence of salt, occurs along beaches, salt-water lagoons and low, broken, boulder-strewn shores.
The endemic fauna includes invertebrate, reptile and bird species. There are a few indigenous mammals. All the reptiles are endemic, except two marine tortoises, and include giant tortoise (Geochelone elephantopus), terrestrial iguanas (Conolophus subcristatus and C. pallidus), and marine iguana (Amblyrhynchus cristatus).
The origin of the flora and fauna of the Galápagos has been of great interest to people ever since the publication of the “Voyage of the Beagle” by Charles Darwin in 1839.The islands constitute an almost unique example of how ecological, evolutionary and biogeographic processes influence the flora and fauna on both specific islands as well as the entire archipelago.
The 1999 resident population numbered some 15,600 persons. Freshwater is a critically limiting factor, and only San Cristobal has adequate perennial supplies for the local human population. Tourism, cattle grazing and fishing are key components of the islands' economy. Immigration from the mainland is uncontrolled and increasing.