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.
Newton River is an official name, gazetted on 4 February 1960, after being in use by local fishermen for some time. It is about 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.
The beech forest in the valley includes black beech (tawairauriki), kÃÂmahi, and silver beech (tawhai).