Erfenis
| Dam Name | Erfenis |
| River | Groot Vet |
| Main Basin | Orange |
| Sub Basin | Vaal |
| Near City | Theunissen |
| Administration City | Free State |
| Country | South Africa |
| Year | 1959 |
| Dam Height | 34 |
| Dam Length | -99 |
| Area(Sqkm) | 19.8 |
| Area(Polygonal) | 19.8 |
| Capital Expenditure | 224.1 |
| Depth(M) | 11.3 |
| Avg Displacement Of Water | 1610 |
| Catchment Area In Sqkm | 4757 |
| Main Usage | Water supply |
| Status | 3: Fair |
| Longitude | 26.77875 |
| Latitude | -28.51125 |
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