| Arnst River | |
| Pushpin Map: | New Zealand South Island#New Zealand |
| Pushpin Map Size: | 270px |
| Pushpin Map Caption: | Mouth of the Arnst River |
| Source1: | Paratītahi Tarns |
| Source1 Location: | about 1700m (5,600feet) |
| Source1 Coordinates: | -41.8962°N 172.8472°W |
| Source1 Elevation: | 82m (269feet) |
| Mouth Elevation: | about 680m (2,230feet) |
| Mouth Coordinates: | -41.9329°N 172.8082°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Subdivision Type2: | District |
| Subdivision Name2: | Tasman |
| Progression: | Paratītahi Tarns → Arnst River → Travers River → Lake Rotoiti → Buller River → Tasman Sea |
| River System: | Buller River |
The Arnst River in New Zealand is a tributary of the Travers River, which itself flows into Lake Rotoiti, in Nelson Lakes National Park.[1] [2]
The park is at the northern end of the South Island of New Zealand.[3] The Arnst River is named after the champion rower Jacob Diedrich Arnst, known as Richard Arnst or Dick Arnst.