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An island of New Zealand southwest of North Island, from which it is separated by Cook Strait. It is the larger but less populous of the country's two principal islands.
(Placename) the South Island the largest island of New Zealand, separated from the North Island by the Cook Strait. Pop: 1 048 200 (2013 est). Area: 153 947 sq km (59 439 sq miles)
the largest island of New Zealand. 863,603; 57,843 sq. mi. (149,813 sq. km).