Arnold River
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The Arnold River is located in the west of New Zealand's South Island. It is the outflow of Lake Brunner, which it links with the Grey River. The Arnold River flows northwest for 20 kilometres, joining the Grey immediately above the town of Brunner, some 15 kilometres from the Tasman Sea.
A small hydroelectric station is located on the river close to its confluence with the Grey.
The river's name is Kotukuwhakaoka in the Māori language.