The Transvaal Republic became a British colony after the Boer War in 1902, and then a large province in the Union of South Africa, which was created in 1910. For sporting purposes, it was broken into a number of smaller entities -  Southern, Eastern, Western and Northern Transvaal. Southern Transvaal was usually just referred to as "Transvaal."

In the 1970's a sporting province known as the Vaal Triangle was created around Sasolburg, van der Bijl Park and Vereeniging.

NOTE: No maps showing the old provinces of South Africa were found online. Provincial boundaries were redrawn after 1995.

Southern Transvaal 

The industrial and mining center of the country, including Johannesburg and its surrounding towns including Randburg, Sandton, and Edenvale. The small but densely populated province has numerous municipal, state and private school swimming facilities - and few dead pools.

Northern Transvaal

The sporting province dates from the 1920's, originally part of Transvaal province. It covered an area that stretches in a V-shape north from Pretoria along the N1, to the Rhodesian/Zimbabwe border. It also included Pietersburg, Louis Trichard, Tzaneen and other smaller centres.

Western Transvaal

The province is a mix of gold ming and farming. The home of the Mielieboere, this province stretched from the western suburbs of Johannesburg to the Botswana border. Towns inluded Rustenburg, Krugersdorp, Roodepoort, Potchefstroom and Klerksdorp.

Eastern Transvaal

East of Johannesburg - all the way to the Mozambique border, lies the Eastern Transvaal - now known as Mpumalanga. The province, including towns like Benoni, Boksburg, Springs, Witbank, Ermelo, Nelspruit, and numerous smaller centres was once a powerhouse of South African water polo. It was also the home of the SAASU under Boksburg attorney Issy Kramer.