|Main source||Fenian Range|
|River mouth||Oparara River|
|Length||8 kilometres (5.0 mi)|
The Postal River is a river of the West Coast Region of New Zealand's South Island. It flows west from the Fenian Range, reaching the Oparara River five kilometres northeast of Karamea. The Postal River's entire length is within Kahurangi National Park.
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