What is sighting in open water and how implement sighting skills in your swim sessions?

Henley Swim’s annual 14km swim marathon in the Thames. Discover a secret part of the Thames like never before through beautiful peaceful curving thames route. This beautiful route from Henley up to Marlow takes swimmers past green luscious river banks with sprawling mansions, discover nature and parts of the Thames you wouldn’t if by foot. One not to be missed in the swim calendar.