Cuba is an archipelago made up of the largest island of the Greater Antilles, the Isla de la Juventud and 4,195 other keys, islets and adjacent islands. Its length is 1,250 km from Cabo de San Antonio, to the west, to Punta de Maisí, its eastern end, and it has a width that varies between 32 and 210 kilometers; its greatest width reaches it in the eastern region and the narrowest point in the western zone. It has about 4000 km of coastline. The country has three large mountain systems: the Sierra de los Órganos, the Sierra del Escambray and the Sierra Maestra; the latter, located in the southeast of the country, is the highest and most extensive, and it is home to the Real del Turquino peak (2,005 m), the highest in Cuba.