The temperature in these ponds is about 15 degrees all year. We hired wetsuits(including gloves and hats) to swim through the ponds. It was like swimming through the best freshwater fish tank! Here's the Wikipedia entry: *Ewens Ponds* is a series of three water-filled limestone <https://en.m.wikipedia.org/wiki/Limestone> sinkholes <https://en.m.wikipedia.org/wiki/Sinkholes> in the Australian state of South Australia <https://en.m.wikipedia.org/wiki/South_Australia>located in the gazetted locality of Eight Mile Creek <https://en.m.wikipedia.org/wiki/Eight_Mile_Creek,_South_Australia> on the watercourse known as Eight Mile Creek <https://en.m.wikipedia.org/wiki/Eight_Mile_Creek_(South_Australia)> about 25 kilometres (16 mi) south of Mount Gambier <https://en.m.wikipedia.org/wiki/Mount_Gambier,_South_Australia> and 8.4 kilometres (5.2 mi) east of Port Macdonnell <https://en.m.wikipedia.org/wiki/Port_Macdonnell,_South_Australia>. <https://en.m.wikipedia.org/wiki/Ewens_Ponds#cite_note-PLB-2> The ponds are popular with recreational divers <https://en.m.wikipedia.org/wiki/Recreational_diving> due to underwater visibility of up to 80 metres (260 ft).[*verification needed <https://en.m.wikipedia.org/wiki/Wikipedia:Verifiability>*] It has a large fish population including the endangered golden pygmy perch <https://en.m.wikipedia.org/wiki/Golden_pygmy_perch>. Ewens Ponds has been part of the Ewens Ponds Conservation Park <https://en.m.wikipedia.org/wiki/Ewens_Ponds_Conservation_Park> since 1976.
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