Originally named Albemarle Island by pirate Ambrose Cowley, Isabela is one of the youngest and largest of the Galápagos archipelago. It was formed by six volcanoes: Sierra Negra, Wolf, Alcedo, Cerro Azul, Darwin and Ecuador. All are active except Ecuador; Sierra Negra erupted most recently in 2018.

Isabela's famous Los Túneles ('tunnels') are a series of pools sheltered from the sea’s currents with interlacing volcanic bridges spanning the depths. The crystal waters are home to decades-old sea turtles, large sea horses, white-tipped reef sharks and thriving schools of tropical fish.

Also on Isabela you can take a horseback ride to the top of the Sierra Negra Volcano, spot Humpback Whales off the western coast of the island (June to September), see the Galápagos penguins near Tagus Cove – a favourite of pirates and whalers; names of ships dating back to 1836 are carved into the nearby cliff sides.