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Marlborough, unitary authority, northeastern South Island, New Zealand. It is bounded by Cook Strait (north), the South Pacific Ocean (east), Canterbury regional council (southeast and south), and Tasman and the city of Nelson unitary authorities (west). The Wairau River rises in western Marlborough in the Spenser Mountains, the source of headwaters of many smaller rivers as well. The Wairau flows northeast, south of the Richmond Range, into Cloudy Bay. Other important rivers are the Awatere...