The island is 17.5 km south of São Jorge and just 7 km east of Faial, in the Central Group of islands, an area that is colloquially known as o Triangulo (The Triangle). Pico is 46 kilometers long, and at its maximum extent about 16 kilometers wide, rising from its center to the west in the summit of the stratovolcano of Pico; making it the second largest of the Azores islands. Along the central plain of volcano cones to the eastern coast, the landscape is pitted with the remnants of craters and lake-filled cones, and dominated by the ancient volcano of Topo. Geomorphologically, the island is composed of three units: