Utila (Isla de Utila) is the smallest of the Honduras' major Bay Islands, after Roatán and Guanaja, in a region that marks the south end of the Mesoamerican Barrier Reef System, the second-largest in the world. The eastern end of the island is capped by a thin veneer of basaltic volcanic rocks, erupted from several pyroclastic cones including 74 m Pumpkin Hill which forms the highest point on the island.