Vereeniging is located where the Klip River empties into the northern loop of the Vaal River. It is named after the Dutch word meaning association or union. Vanderbijlpark is its nearby neighbour to the west. Like its neighbour, it too is an industrial hub, manufacturing iron, steel, pipes, bricks, tiles and processed lime.
The town was founded in 1892 and much of its early existence revolved around coal mining. The town is located where the Treaty of Vereeniging, ending the Second Boer War, was negotiated. Preceding the treaty a concentration camp was erected by the British forces. The town's image was scarred by the Sharpeville Massacre in which 69 people were killed in 1960.