We chanced upon the Te Waikoropupu Springs and they were amazing.
They form part of the karst landscape of the Tasman area and are New Zealand's biggest springs.
The clarity and amount of the water is staggering. Visibility is an amazing 63 metres. Outflow averages around 10 cubic metres a second. The degree of visibility is 'is very close to optically pure water, with clearer water found only beneath Antarctica’s near-frozen Weddell Sea' (DOC).
Water comes from both shallow and deep sources. The deep source water is estimated to be in the region of 10 years old.
For further information on the springs, their Maori significance as a sacred place and the plants and animal follow this link and click on the pdf link below 'Interpretation Panels'.