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The southern region is without an interior valley; it disappears below the sea at Puerto Montt. The long chains of islands along the coast are formed by the peaks of the submerged coastal mountains. The coastline here is indented by numerous fjords. The southern Andes have elevations that seldom exceed 1,800 m (6,000 ft). Chile lies in a zone of geologic instability and is subject to earthquakes and volcanic activity. |
