Isabela Island is a hidden gem within a treasure. Shaped as a sea horse, Isabela is the largest island of the Galapagos and one of the younger ones. Isabela Island was formed about 1 million years ago by the joining of six shield volcanoes — from north to south — Ecuador, Wolf, Darwin, Alcedo, Sierra Negra, and Cerro Azul. All of the volcanoes still active except Ecuador. The western flanks of Ecuador Volcano have collapsed into the sea. Wolf Volcano, with an elevation of 1707 m (5600 ft.), is the highest point of Isabela Island and all Galapagos Islands. Two of the volcanoes, Ecuador and Wolf lie directly on the equator. Isabela is one of the more volcanically active islands. Eruptions have been recorded in the last fifty years for Wolf Volcano (1963 and 1982) (its last eruption occurred on the 25th of May 2015), Alcedo (1993), Sierra Negra (1963, 1979, and 2005), and Cerro Azul (1959, 1979, 1998, and 2008). The island is primarily noted for its geology, providing excellent examples of a geologic occurrence that created the Galapagos Islands including uplifts at Urvina Bay and the Bolivar Channel, tuff cones at Tagus Cove, and Pulmace on Alcedo and Sierra Negra, one of the most active volcanoes in the world and the second largest crater worldwide (11km diameter).