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Orakei Korako also known as 'The Hidden Valley, is a highly active geothermal area situated in the Taupo Volcanic Zone on the Waikato River at Lake Ohakuri, which is part of the hydro-electric power scheme. The formation of the lake raised the Waikato River at Orakei Korako by 18m, flooding more than 250 hot springs and geysers. Even with two-thirds of the original geothermal area covered by the artificial lake, Orakei Korako is still New Zealand's largest geyser field and one of the country's must-see natural attractions.