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Dimensions - Tristan has an average diameter of 12kms (7.5 miles) and a circumference of about 40 km (25 miles); The volcanic cone which is Tristan da Cunha rises from an ocean plain some 3500 metres (11500 feet) below sea level and its peak reaches 2082 metres (6750 feet) above sea level - overall the Tristan volcano rises some 5500 metres (18000 ft) from the sea floor where it is about 48kms (30 miles) in diameter. |