Everything about Swim For Sharks, the annual 3.4 km conservation swim around Koh Nang Yuan — the schedule, the kids programme, how to prepare, and where the money goes.
12 April 2025 · updated 27 February 2026 · by Bryan Roseman
In short. Swim For Sharks Koh Tao is an annual 3.4-kilometre conservation swim around the Koh Nang Yuan islands that combines marine activism with athletic achievement. The 2025 edition took place on 17 May. It is a pioneering event by Shark Guardian to raise funds and awareness for shark protection while offering participants an unforgettable open-water swimming experience in one of Thailand’s most pristine marine environments.
The crystal waters surrounding Koh Tao’s famous diving destination provide the perfect backdrop for one of Southeast Asia’s most significant marine conservation events. Swim For Sharks represents more than just an athletic challenge — it’s a powerful statement about humanity’s responsibility to protect apex predators that have maintained ocean balance for over 400 million years.
Whether you’re an experienced swimmer seeking your next challenge or a conservation enthusiast wanting to make a tangible difference, this event offers multiple ways to contribute to shark protection while experiencing the natural beauty that makes Koh Tao’s marine ecosystem world-renowned.
Sharks face unprecedented threats in modern oceans, with populations declining by up to 90% in some regions due to overfishing, habitat destruction and climate change. As apex predators, sharks maintain the delicate balance of marine ecosystems by controlling fish populations and preventing any single species from overwhelming others.
Every participant in Swim For Sharks contributes directly to reversing these alarming trends through research funding, education programmes and policy advocacy.
The waters around Koh Tao serve as critical habitat for multiple shark species, making local conservation efforts particularly important. Reef sharks, whale sharks and other species rely on healthy coral reefs and abundant fish populations — ecosystems that benefit enormously from targeted protection programmes funded by events like Swim For Sharks.
The day begins with registration and safety briefings, ensuring all participants understand the course route and emergency procedures. Experienced swimmers can tackle the full 3.4-kilometre challenge, while shorter distance options accommodate different fitness levels and abilities.
A small group of conservationists organises the first Swim For Sharks event on Koh Tao, drawing local diving community support.
The event gains global attention, attracting swimmers from over 20 countries and raising significant conservation funds.
The introduction of Kids Swim For Sharks creates family-friendly conservation education opportunities.
The largest event to date, with over 500 participants and substantial funding for multiple conservation projects.
Celebrating 15 years of shark conservation with expanded educational programmes and community involvement.
What started as a grassroots initiative has evolved into one of Thailand’s premier conservation events, demonstrating how local marine life protection can inspire global participation and funding for critical research projects. Follow the latest updates and community stories on the official Swim For Sharks Facebook page to stay connected with this growing conservation movement.
Successful participation in Swim For Sharks requires both physical preparation and an understanding of open-water swimming challenges. The tropical waters around Koh Tao provide ideal conditions, but proper training ensures you can complete the distance safely while enjoying the experience.
Tip. If you’re new to open-water swimming, consider taking some diving lessons in Koh Tao to become more comfortable in ocean environments. Understanding water conditions and marine life behaviour enhances both safety and enjoyment during the swim.
Every registration fee, donation and fundraising effort directly supports Shark Guardian’s comprehensive conservation programmes. These initiatives span research, education and policy advocacy, creating lasting change for shark populations throughout Southeast Asia and beyond.
Direct Impact Areas:
The funds raised through Swim For Sharks also support ongoing monitoring of key dive sites around Koh Tao, ensuring that popular locations maintain healthy shark populations and serve as effective marine protected areas.
Swim For Sharks welcomes participants of all abilities and offers multiple ways to contribute to shark conservation.
For those planning to travel to Koh Tao specifically for the event, many dive centres and accommodations offer special packages combining lodging with event registration. This creates an opportunity to experience the island’s renowned diving while participating in meaningful conservation action.
Warning. Event capacity is limited to ensure safety and environmental protection. Register early through official channels and verify registration requirements, including any required swimming ability assessments or medical clearances.
Non-swimmers can contribute through volunteering opportunities, attending educational sessions, or supporting participants through fundraising efforts. The event’s inclusive approach ensures everyone can participate in shark conservation regardless of swimming ability.
While Swim For Sharks provides an annual focal point for shark conservation, protecting these apex predators requires consistent daily actions and awareness. Participants often become long-term advocates for marine protection, extending their impact far beyond the single event.
Consider timing your visit during optimal diving seasons in Koh Tao to witness first-hand the marine life that benefits from conservation efforts. Many swimmers report that observing sharks in their natural habitat during diving experiences strengthens their commitment to protection efforts.
Ready to connect with the marine life you’re helping to protect through Swim For Sharks? La Bombona Diving offers you the chance to encounter sharks, rays and abundant marine life in their natural habitat around Koh Tao’s reefs, with guides who know the island’s ecosystem and a conservation-minded approach to every dive. Start with a Try Dive (2,500 ฿) or go for the full Open Water certification (11,000 ฿) — all equipment included.
The main 3.4 km swim requires strong swimming ability and open-water experience. However, shorter distance options and non-swimming activities ensure everyone can participate meaningfully in shark conservation. Safety boats provide support throughout all swim distances, and participants can exit the water at any time if needed.
Registration opens several months before the event through Shark Guardian's official website and authorised partners on Koh Tao. Early registration is recommended as spaces are limited. Registration includes event participation, safety support, educational materials and post-event celebrations.
Comprehensive safety protocols include mandatory briefings, support boats throughout the course, qualified lifeguards, medical personnel on standby and clearly marked swim routes. All participants receive safety equipment, and weather conditions are carefully monitored before and during the event to ensure optimal safety conditions.
Funds directly support Shark Guardian's conservation programmes, including shark research projects, educational outreach to schools and communities, policy advocacy for stronger protection laws, and community-based conservation initiatives.
More in Features
FeaturesCourse fees, accommodation, food, gear, visas and insurance: a realistic line-by-line budget for two months of Divemaster training in Koh Tao, plus what a good course fee should include.
FeaturesFifteen practical checks — inclusions, hidden costs, course length, PADI vs SSI vs RAID pathways, mentorship and career support — to compare Divemaster courses in Koh Tao before you pay a deposit.
FeaturesWhat fair instructor pay looks like on Koh Tao — La Bombona Diving's per-course rates, the benefits beyond base pay, the rising cost of living and the career paths that make diving a sustainable profession.
Message us on WhatsApp — courses, fun dives and honest advice about Koh Tao.
Chat on WhatsApp