Patagonia extends from within Reloncavi, at the height of parallel 41°S, to the south. During the last glaciation, this area was covered by ice that strongly eroded Chilean relief structures. As a result, the intermediate depression sinks in the sea, while the coastal mountains rise to a series of archipelagos, such as Chiloé and the Chonos, disappearing in Taitao peninsula, in the parallel 47°S. The Andes mountain range loses height and erosion caused by the action of glaciers has caused fjords.