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...erosion of the caldera whose volcano created the island’s western peninsula, Iao Valley comprises a deep, narrow gorge 5 miles (8 km) long and flanked by heavily forested walls almost a mile high. Iao Needle, a volcanic monolith 2,250 feet (686 metres) high, soars nearly straight up from the valley floor. A 6-acre (2.5-hectare) section of the valley featuring the Iao Needle is designated a...
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