The Erfenis Dam is an earth-fill type dam located in the Free State province of South Africa, on the Vet River, near Theunissen. It was established in 1960 and its primary purpose is for irrigation use. The hazard potential of the dam has been ranked high (3).

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Erfenis Dam
Location of Erfenis Dam in South Africa
Official name	Erfenis Dam
Country	South Africa
Location	Theunissen, Free State
Coordinates	28°30′39″S 26°46′38″E
Purpose	Irrigation
Opening date	1960
Owner(s)	Department of Water Affairs
Dam and spillways
Type of dam	Earth fill dam
Impounds	Groot-Vet, Klein-Vet, Soutspruit
Height	34 m
Length	489 m
Reservoir
Creates	Erfenis Dam Reservoir
Total capacity	212 340 000 m³
Catchment area	4,724 km2 (1,824 sq mi)
Surface area	32.91 km2 (12.71 sq mi)

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• List of reservoirs and dams in South Africa
• List of rivers of South Africa