The continental coastline features numerous inlets and fjords, from which the mountains seem to rise straight up to great elevations; this is, for example, the case with the Cerro Macá (2,300 meters) near Puerto Aisén. The rest of the land consists of literally thousands of islands forming numerous archipelagos interwoven with sometimes-narrow channels, which provide the main routes of navigation. The grouping of such islands shows that they are in part the summits of a submerged mountain chain, a continuation southward of the Chilean Coast Range. Three groups of these, called Chiloé, Guaitecas and Chonos archipelagoes, lie North of the Taitao Peninsula.