It is in the Canterbury Region and is a tributary of the Waiau Toa / Clarence River.

The Bluff River flows south for 10 kilometres (6 mi) from the slopes of Mount Major in the Inland Kaikōura Range.

Confusingly, the Bluff Stream, another tributary of the Waiau Toa / Clarence, follows a largely parallel course 5 kilometres (3 mi) to the east.

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