Waiau Toa / Clarence River
General data
- Name: Waiau Toa / Clarence River
- Water system: Pacific Ocean
- Water type: River
- Progression: Pacific Ocean -> Planet Earth
- Climates: Temperate
- Continents: Australia & Oceania
- Countries: New Zealand
The Clarence River (officially Waiau Toa / Clarence River) is a major river which flows through the Kaikōura Ranges in the northeast of New Zealand's South Island. At roughly 209 kilometres (130 mi) long, it is the longest river in Canterbury and the eighth longest in New Zealand.
For its first 50 kilometres (31 mi), the river runs in a generally southeastern direction. It then turns northeast, running down a long straight valley between the Inland and Seaward Kaikōura Ranges. At the end of the Seaward Kaikōuras, the river meanders through undulating hill country before draining into the Pacific Ocean near the town of Clarence. A large part of the river is within the boundaries of Molesworth Station.