Isabela is the largest island in the archipelago. This island consists on a chain of five volcanoes, from which Volcano Wolf is the highest. Puerto Villamil is a small port on Isabela, where not many travellers pass by. Urbina Bay, located on the western coast of Albemarle Island at the foot of Alcedo Volcano, was uplifted from the sea in 1954. Flightless cormorants and pelicans nest along the coast during their nesting seasons, and turtles and rays can be seen in the bay. Highlands include large and colorful land iguanas. Tagus Cove, a tour along the cliffs in a launch will give the visitors a good chance to see the Galapagos penguin, the flightless cormorant and other sea birds. The Experimental Station is located very near Puerto Villamil in the south of Albemarle. Volcano Sierra Negra, located at the southern end of Isabela, is one of the best and most impressive examples of a volcano in the archipelago. This is the second largest crater in the world after Ngorongoro in Africa.