The Grey River / Māwheranui is located in the northwest of the South Island of New Zealand. It rises in Lake Christabel, one of numerous small lakes on the western side of the Southern Alps,12 kilometres southwest of the Lewis Pass, and runs westward for 120 kilometres before draining into the Tasman Sea at Greymouth. The river was named by explorer Thomas Brunner in honour of New Zealand politician Sir George Grey.
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