| Avon River | |
| Subdivision Type1: | Country |
| Length Km: | 20 |
The Avon River flows northeast from its sources in rough country southwest of Blenheim to reach the Waihopai River 20km (10miles) from the latter's outflow into the Wairau River of New Zealand.Tummil River is a tributary of the Avon, joining it southwest of Blenheim.