Española and San Cristóbal
The Española and San Cristóbal are over 3 million years old, the Isabela and Fernandina are well under 1 million. According to UNESCO "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 Galápagos Islands. Almost no other site in the world offers protection of such a complete continuum of geological and geomorphological features." Tenerife and Fuerteventura are the two largest of the Canary Islands; Beata and Catalina are two of the islands of the Dominican Republic.