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Te Waikoropupū Springs are the largest freshwater springs in New Zealand, the largest cold water springs in the Southern Hemisphere and contain some of the clearest water ever measured.
Te Waikoropupu Springs (known as Pupu Springs), discharge 14,000 litres of water per second.
The qualities of the water from Te Waikoropupu Springs are of considerable scientific interest. In 1993, The National Institute for Water and Atmosphere (NIWA) carried out optical measurements under water and found that the visibility was 63 metres.
This is very close to optically pure water, with clearer water found only beneath Antarctica’s near-frozen Weddell Sea. The water clarity is a result of natural filtering prior to the water’s emergence at Te Waikoropupu Springs.