10 x 10 swim
From Openwaterpedia
noun - A 10 x 10 swim is an open water swimming competition or solo swim that is at least 10 km in distance with an average water temperature of 10°C.
10 x 10 Examples
- Milnerton Lighthouse to Big Bay Swim, 10.5 km marathon swim in South Africa with an expected water temperature between 9°C and 15°C