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In page South Island:

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The island has been known in English as the South Island for many years. The Te Reo Māori name for it Te Waipounamu now also has official recognition.[1][2] The name is most often translated to mean "the water(s) of pounamu",[3] but possibly evolved from Te Wāhi Pounamu ("the place of pounamu").[citation needed] It was first recorded in English by Captain James Cook on his voyage to New Zealand in 1769. North Island iwi alternatively used the name Te Waka-a-Māui ("the canoe of Māui") for the South Island.[4]