Groot River (Western Cape)
|Etymology||From Grootrivier, meaning "big river" in the Afrikaans language|
|⁃ location||Cederberg Mountains|
|Source confluence||Twee / Lang|
|⁃ elevation||735 m (2,411 ft)|
|Confluence with the Riet River, Western Cape|
|456 m (1,496 ft)|
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.
The river 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.