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Lake Taupō fills a caldera (volcanic depression) formed by massive eruptions. The first eruption, about 26,000 years ago, covered the central North Island with pumice and ash; the last, about 1,800 years ago, was so dramatic that its effects were noted in China and Rome. In Māori tradition the lake is home to a taniwha (supernatural being) called Horomatangi. Archival audio sourced from Radio New Zealand Sound Archives, http://www.soundarchives.co.nz/. Sound files may not be reused without permission from Radio New Zealand Sound Archives (Reference number sa-97112-26-01-pm).