| Groot River | |
| Name Etymology: | From Grootrivier, meaning "big river" in the Afrikaans language |
| Pushpin Map: | South Africa |
| Pushpin Map Caption: | Location of the Groot River mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | South Africa |
| Subdivision Type2: | State |
| Subdivision Name2: | Western Cape |
| Source1: | _ |
| Source1 Location: | Cederberg Mountains |
| Source Confluence: | Twee / Lang |
| Source Confluence Coordinates: | -32.7747°N 19.2931°W |
| Source Confluence Elevation: | 735m (2,411feet) |
| Mouth: | Riet River |
| Mouth Location: | Confluence with the Riet River, Western Cape |
| Mouth Coordinates: | -32.6133°N 19.4528°W |
| Mouth Elevation: | 456m (1,496feet) |
The Groot River (English: "Large River") is a river in the Western Cape Province, South Africa. It is part of the Olifants/Doring River system. It is not to be confused with the Groot River of Eastern Cape or the Groot River of Southern Cape provinces.
It is formed by the confluence of the Twee River and Lang River, flowing off the eastern slopes of the Cederberg Mountains, south-east of Citrusdal.
The Groot flows in an easterly direction through the Skurweberge Mountains where it joins the Riet River that rises as the Winkelhaak River and Houdenbeks River north of Ceres. Below this confluence, the Riet River is joined by the Brandkraals River and Matjies River, after which it flows into the Doring River.[1]
The Clanwilliam Yellowfish (Labeobarbus capensis), a local endemic classified as Vulnerable by the IUCN, is found in this river.[2]
