| Newton River | |
| Native Name: | Maori: Waipōuri |
| Pushpin Map: | New Zealand#New Zealand South Island |
| Pushpin Map Size: | 270px |
| Pushpin Map Caption: | Mouth of the Newton River |
| Source1: | Lake Fraser |
| Source1 Coordinates: | -45.8869°N 166.4993°W |
| Source1 Elevation: | 31m (102feet) |
| Mouth Location: | Tasman Sea |
| Mouth Elevation: | 0m (00feet) |
| Mouth Coordinates: | -45.9083°N 166.4337°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 9km (06miles) |
| Progression: | Newton River → Tasman Sea |
The Newton River is a river in Fiordland, New Zealand. It drains Lake Fraser south-westward into the Tasman Sea just south of West Cape.[1]
Newton River is an official name, gazetted on 4 February 1960, after being in use by local fishermen for some time. It is about 9km (06miles) long.
The river flows over the Newton River pluton of Carbonferous biotite, granodiorite and granite, which has been glaciated and also forms a rock arch to the south of the river mouth, where a marine terrace has been uplifted within the last half a million years.[2]
The beech forest in the valley includes black beech (tawairauriki), kāmahi, and silver beech (tawhai).[3]