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The Río San Pedro de Inacaliri (often simply called the Río San Pedro) has carved this canyon into the high plateau of the Chilean Puna. The striking, block-like cliffs consist of thick ignimbrite deposits (volcanic pyroclastic flow sediments). In the background rises the Palpana volcano. It is a massive stratovolcano, approximately 6,040 metres high, in the Chilean Andes near the border with Bolivia. – Chile – 1976