Composed of five coalesced volcanoes, Isabela is the largest island in the Galapagos and the most recently active, the latest eruption having occurred in 2015. Here we will see large land iguanas, finches, and if lucky, a giant tortoise or two. In 1954, the intrusion of magma below one of the island’s volcanoes caused part of the bay to be uplifted some 6 meters, and today we can walk through the remains of what was once a thriving underwater reef.