Probably the most striking region of the Galapagos Archipelago is the west, which comprises Isabela and Fernandina Islands. These are the youngest islands, both of which have experienced volcanic eruptions in the last twelve months. The Cromwell Undercurrent upwells here, bringing nutrients from the depths of the Pacific Ocean; these constant upwellings make this a highly productive area, with various endemic species of the Galapagos benefitting from it.