| Waihemo / Shag River | |
| Name Etymology: | The Māori name Waihemo means "river that has gone away" Early whalers named the river Shag after the seabird |
| Pushpin Map: | New Zealand |
| Pushpin Map Size: | 270px |
| Pushpin Map Caption: | Mouth of Waihemo / Shag River |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Subdivision Type2: | Region |
| Subdivision Name2: | Otago |
| Length: | 75km (47miles) |
| Source1: | Kakanui Range |
| Mouth: | Pacific Ocean |
| Mouth Coordinates: | -45.4833°N 219°W |
| Mouth Elevation: | Sea level |
The Waihemo / Shag River is located in Otago in the South Island of New Zealand. It rises in the Kakanui Range, flowing southeast for 75km (47miles),[1] or 50km (30miles) before reaching the Pacific Ocean on the south side of Shag Point / Matakaea, 7.5km (04.7miles) east of Palmerston. The Dunback Branch railway that operated from the 1880s to 1989 largely followed the route of the river from its junction with the Main South Line near Shag Point township to its terminus in Dunback.
The small- to medium-sized river has been adversely affected over the past decades by farming practices in the area. Much of its length is overgrown with willows, and during the summer its flow can become significantly reduced.[2]
In 1985, the name of the river was gazetted as Shag River (Waihemo). In August 2021, the name was officially amended to Waihemo / Shag River.
Waihemo means a ‘river that has gone away’ or ‘dwindled’. Early whalers named the river after the common seabird.