Open Water Swimming at Herts Young Mariners Base
Difficulty
easy
Duration
1–2 hours
Fitness Level
Swimmers should have a basic level of cardiovascular fitness and comfort in open water.
Overview
Join the Mariners Mile Swim on September 27, 2025, for a scenic and supportive open water challenge in Hertfordshire’s Lea Valley. Perfect for swimmers of all levels, this event combines nature, sport, and community in a memorable way.
Adventure Tips
Wear appropriate swim gear
Ensure your wetsuit or swimwear is suitable for cool water temperatures and comfortable for a prolonged swim.
Hydrate beforehand
Drink plenty of water before the race to stay hydrated during the swim.
Arrive early
Give yourself plenty of time for warm-up, registration, and acclimating to the water.
Check water conditions
Be aware of weather and water temperature on race day to adjust gear accordingly.
Local Insights
Wildlife
- Kingfisher
- Otters
History
Lea Valley has been a vital waterway for centuries, historically supporting trade and recreation, now serving as a popular open water swimming spot.
Conservation
HYMB emphasizes sustainable practices, such as river clean-up initiatives and eco-friendly event management, to protect this natural resource.
Frequently Asked Questions
Recommended Gear
Wetsuit
A wetsuit helps maintain body temperature and provides buoyancy in open water.
fall specific
Swim cap
A swim cap reduces water resistance and keeps hair out of your face.
Goggles
Goggles protect your eyes and improve visibility underwater.
Towel
A towel is handy for drying off and warming up post-swim.