On the national road north towards Zimbabwe is the flat area known as the Springbok Flats, part of the Great Rift Valley. About 80 miles (125km) north of Johannesburg on the edge of the Flats lies the town of Warmbaths, named for the hot mineral springs that rise to the surface there. The spring yields about 20,000 litres of water, enriched with sodium chloride, calcium carbonate and other minerals every hour. The town has now become a popular spa and holiday resort, considered to be one of the most modern of its kind in the world. It has a large indoor pool with underwater jets, outdoor hot and cold swimming pools, wave pools, and water slides.
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