A tributary of the Waiau Uwha River, it skirts the northern slopes of the Hanmer Range, flowing south then west for 15 km before joining the Waiau Uwha.

The river rises on the southern slopes of the Saint James Range, close to Mount Horrible and Mount Sadd.

It initially flows south through a steep sided valley before turning westwards.

At its western end, it passes through a steep-sided gorge close to its junction with the Waiau Uwha.

This article about a river in Canterbury, New Zealand is a stub.