Swimmers of all ages and abilities will descend on Lake Okataina for a celebration of open water swimming tomorrow.
Swimmers can register on the day with a choice of 400m, 800m, 1.5km, 3km or 6km distances.
Organiser Katrina Allison said the primary aim of the event was to get people swimming and making the most of the "sparkling waters and beautiful surroundings of Lake Okataina".
"Open water swimming is such an up-and-coming sport and it's a tremendous challenge. For us it's not hugely competitive, it's a time to have an experience swimming in the lake without any pressure.
"There are heaps of spot prizes and it's a really family-oriented, fun event. We want to get people swimming and enjoying the sport of swimming."