Open Water Swimming Destinations Worldwide

Updated for 2026 — Accurate as of February 2026.

Open water swimming has exploded in popularity over the past five years, growing from a niche endurance pursuit into a mainstream adventure travel activity. The reasons are not hard to understand: it requires almost no equipment, it is accessible to anyone who can swim, it takes you into natural environments that are stunningly beautiful, and it provides a physical and mental challenge that is deeply satisfying.

The global open water swimming market has grown by an estimated 25 percent since 2022, with organized swims, guided experiences, and swim-specific travel companies multiplying across every continent. Whether you want to swim between Greek islands, cross an alpine lake at sunrise, or complete a channel swim that puts you in an elite club of marathon swimmers, there is a destination and an experience waiting for you.

I have swum in open water in 15 countries over the past four years, from the warm turquoise of the Adriatic to the ice-cold lakes of the Scottish Highlands. This guide covers the best open water swimming destinations in the world, from gentle introductory swims to bucket-list endurance challenges.

The Greek Islands: Island-to-Island Swimming

The Greek Islands offer what might be the most beautiful open water swimming in the world. The water is warm (24-27 degrees Celsius from June through September), impossibly clear, and colored in shades of blue and turquoise that look photoshopped. The distances between islands in many archipelagos are short enough (1-5 km) to swim, creating the unique experience of swimming from one island to another.

The Cyclades, Saronic Islands, and Dodecanese all offer excellent swim routes. Organized swim events have proliferated in recent years. The Santorini Experience includes a 1.5 km open water swim in the caldera. The Authentic Marathon Swim retraces the route of the ancient Greek messenger across the Saronic Gulf. And several companies now offer multi-day guided swim-touring trips through the islands, where you swim from island to island, with a support boat alongside, and stay at each island overnight.

I did a 5-day swim tour through the Saronic Islands in September 2025, swimming 3-5 km per day between Aegina, Angistri, Poros, and Hydra. The water was 25 degrees, the visibility was 15+ meters, and swimming into the harbor of a Greek island village, pulling yourself out on the dock, and walking to a taverna for lunch was one of the best travel experiences of my life.

Water temperature: 22-27 degrees Celsius (June-September) Best swim distance: 1-5 km island-to-island crossings Difficulty: Beginner to intermediate (calm conditions, warm water, support boat available on guided trips) Best season: June through September Guided swim tours: From 1200 EUR for 5 days including accommodation, support boat, and guide Where to stay: Island guesthouses from 30 EUR per night Getting there: Fly to Athens. Ferries to all island groups.

Pro Tip: The Saronic Islands are the most accessible from Athens (1-2 hours by ferry) and offer the calmest conditions. The Cyclades are windier (the Meltemi wind blows strongly in July-August) and better suited to experienced open water swimmers.

Lake Zurich, Switzerland

Lake Zurich is the center of European open water swimming culture. On any summer morning, you will see hundreds of swimmers in the lake, from casual bathers to serious distance swimmers training for channel crossings. The city of Zurich has built its relationship with its lake around swimming: public swimming areas (Badis) line the lakeshore, and the annual Zurichsee-Uberquerung (Lake Zurich Crossing) attracts over 10,000 swimmers for a 1.5 km crossing of the lake.

The water is clean (you can drink it), the temperature is comfortable (20-24 degrees in summer), and the setting of alpine foothills rising above the lake is beautiful. For distance swimmers, the lake is 40 km long and offers point-to-point swims of any distance along its shore.

Water temperature: 18-24 degrees Celsius (June-September) Best swim distance: 1.5 km (lake crossing) to 40 km (length of lake) Difficulty: All levels Best season: June through September Events: Zurichsee-Uberquerung (July), various club-organized swims throughout summer Where to stay: Zurich has hostels from 35 CHF and hotels from 100 CHF Getting there: Fly to Zurich Airport (ZRH). The lake is a 15-minute tram ride from the city center.

Photo credit on Pexels

Lake Malawi, Malawi/Mozambique/Tanzania

Lake Malawi is the warm-water swimming paradise that most people have never heard of. Africa’s third-largest lake stretches 580 km from north to south, with crystal-clear freshwater that stays at 24-28 degrees Celsius year-round. The lake is home to over 1,000 species of cichlid fish (more freshwater fish species than any other lake on Earth), making it a simultaneous snorkeling and swimming destination.

The Lake Malawi Marathon Swim, held annually, has put the lake on the open water swimming map. But you do not need to do an organized event to enjoy swimming here. The beaches along the southern shore (Cape Maclear, Monkey Bay) and the island lodges on Likoma and Chizumulu offer perfect conditions for daily open water swims in warm, clear, fresh water.

Water temperature: 24-28 degrees Celsius year-round Visibility: 10-20 meters Difficulty: Beginner-friendly (warm, calm, freshwater) Best season: Year-round (May-October is dry season with slightly cooler, clearer water) Safety note: Bilharzia (schistosomiasis) risk exists in parts of the lake. Some areas are safe and some are not. Research your specific swimming location carefully and consult the CDC’s schistosomiasis page for health advice. Where to stay: Cape Maclear has backpacker lodges from 10 USD per night. Island lodges from 30 USD. Getting there: Fly to Lilongwe (LLW). Bus to Monkey Bay or Cape Maclear (5 hours).

The English Channel: The Marathon Swimmer’s Everest

The English Channel crossing (33.8 km from Dover, England to Cap Gris-Nez, France) is the most prestigious open water swim in the world. It is the benchmark against which all other marathon swims are measured, and completing a solo Channel crossing places you in a club of fewer than 2,500 people, less than half the number who have summited Everest.

The Channel is challenging not primarily for its distance but for its conditions. Water temperatures range from 15-18 degrees Celsius during the swimming season (June-September). Tidal currents are strong and can add 10-20 km to the actual swimming distance. Jellyfish stings are common. And the weather can change rapidly, turning a flat calm crossing into a rough, disorienting ordeal.

A solo Channel crossing typically takes 10-16 hours, and the swimmer must comply with Channel Swimming Association rules: no wetsuit (standard swimsuit only), no touching the support boat, and no artificial aids. The swimmer swims alongside a support boat that provides feeds (liquid nutrition handed on a pole every 30-45 minutes) and navigation.

Distance: 33.8 km (straight line), 40-55 km actual due to tidal drift Water temperature: 15-18 degrees Celsius (June-September) Difficulty: Expert (requires 12-18 months of dedicated training, cold-water acclimatization, and a support crew) Best season: July through September (warmest water, longest daylight) Cost: Support boat hire from 3000 GBP. Channel Swimming Association registration from 120 GBP. Total cost including training camps and support: 5000-8000 GBP. Prerequisites: You must complete a 6-hour qualifying swim in water below 16 degrees Celsius.

Montenegro: The Bay of Kotor

The Bay of Kotor is a stunning, sheltered bay on the Adriatic coast of Montenegro that provides ideal conditions for open water swimming. The bay is essentially a fjord, surrounded by dramatic limestone mountains that rise 1,500 meters from the water. Medieval villages and Venetian fortifications line the shore. The water is warm (22-26 degrees in summer), calm (the bay is sheltered from open Adriatic swell), and clean.

The Kotor Bay Swim, held annually in August, is a 4.5 km cross-bay swim that attracts swimmers from across Europe. But the bay offers swimming opportunities year-round, with numerous beaches, jetties, and swimming platforms along the 100+ km shoreline.

Water temperature: 20-26 degrees Celsius (May-October) Best swim distance: 1-5 km cross-bay swims Difficulty: Beginner to intermediate Best season: May through October Where to stay: Kotor old town has rooms from 25 EUR. Perast has boutique hotels from 60 EUR. Getting there: Fly to Dubrovnik (Croatia) or Tivat (Montenegro). Kotor is 1-2 hours from either airport.

The Bosphorus, Istanbul, Turkey

The annual Bosphorus Cross-Continental Swim is one of the most unique open water swimming events in the world. You swim 6.5 km across the Bosphorus strait from Asia to Europe (or vice versa), with container ships and ferries halted to allow the thousands of swimmers to cross. The setting is extraordinary: you swim between two continents, past Ottoman palaces, medieval fortresses, and the modern Istanbul skyline.

The event attracts over 2,500 swimmers each year and sells out months in advance. The water temperature is typically 20-22 degrees in August when the event is held, and the current assists your crossing, carrying you south toward the Sea of Marmara as you swim across.

Distance: 6.5 km Water temperature: 20-22 degrees Celsius (August) Difficulty: Intermediate (current-assisted, but 6.5 km requires solid fitness) When: Annual event in August. Registration opens in spring and sells out quickly. Cost: Registration from 100 EUR Getting there: Fly to Istanbul (IST or SAW)

Comparison: Open Water Swimming Destinations

Destination	Water Temp	Distance Range	Difficulty	Cost Level	Best For
Greek Islands	22-27°C	1-5 km	Beginner-Int	Medium	Scenic island-to-island swims
Lake Zurich	18-24°C	1.5-40 km	All levels	High	European swim culture
Lake Malawi	24-28°C	Any	Beginner	Low	Warm freshwater, budget
English Channel	15-18°C	34+ km	Expert	High	Marathon swimming prestige
Bay of Kotor	20-26°C	1-5 km	Beginner-Int	Low-Medium	Sheltered scenic swimming
Bosphorus	20-22°C	6.5 km	Intermediate	Medium	Unique cultural experience

Essential Open Water Swimming Gear

Goggles: Invest in well-fitting, leak-free open water goggles with tinted or mirrored lenses for bright conditions. Brands like Zoggs, Speedo, and THEMAGIC5 (custom-molded) are popular. 15-60 USD.

Wetsuit (optional): A triathlon-specific wetsuit provides buoyancy and warmth. Permitted in most organized swims when water temperature is below 20 degrees. Not permitted in English Channel or some traditional marathon swims. 150-500 USD.

Swim skin: A non-neoprene bodysuit that provides minimal thermal protection and UV coverage without the buoyancy of a wetsuit. Used in warm-water swims and in events that prohibit wetsuits. 50-150 USD.

Tow float: An inflatable buoy that attaches to your waist with a short leash and trails behind you. It makes you visible to boats and can be used as a flotation aid in an emergency. The Royal Life Saving Society recommends tow floats for all open water swimmers. Essential for any unsupervised open water swim. 20-40 USD.

Ear plugs: Cold water entering the ear canal can cause disorientation and, over time, surfer’s ear (exostosis). Silicone ear plugs from 5 USD.

Anti-chafe balm: Long swims cause friction burns at the neck, armpits, and groin. Apply liberally before any swim over 2 km. Body Glide or Vaseline. 5-10 USD.

GPS watch: A swim-specific GPS watch tracks your distance, pace, and route. The Garmin Swim 2, Apple Watch Ultra, or COROS Pace 3 are popular options.

Building Up to Your First Open Water Swim

If you are a pool swimmer considering your first open water experience, here is a progression:

Month 1-2: Swim in open water 1-2 times per week in a supervised environment (a beach with lifeguards or an organized open water swimming group). Focus on sighting (lifting your head to navigate), breathing in waves, and getting comfortable with the lack of pool walls and lane lines.

Month 3-4: Build up to continuous swimming of 2+ km in open water. Practice feeding (drinking from a water bottle while treading water). Learn to draft behind another swimmer (swimming in their wake reduces energy expenditure by up to 20 percent).

Month 5-6: Enter your first organized open water swimming event (1-3 km). Experience swimming in a group, managing the start, and racing open water.

Month 7+: Progress to longer distances (5-10 km) and more challenging conditions (cooler water, currents, waves). Consider a guided swim trip to one of the destinations in this guide.

The key psychological challenge in open water swimming is managing the disorientation. There are no lane lines, no black lines on the bottom, and no walls to push off. You navigate by lifting your head every 6-10 strokes to sight on a landmark (a building, a buoy, a point of land). This is called sighting, and it is the fundamental skill that separates open water swimming from pool swimming.

Safety Principles for Open Water Swimming

1. Never swim alone. Always swim with a buddy or within sight of a support boat, kayak, or lifeguard.

2. Know the water. Research currents, tides, water quality, and any specific hazards (boats, jellyfish, underwater obstacles) before entering.

3. Wear a tow float. This makes you visible to boats and provides emergency flotation.

4. Acclimatize to cold water gradually. Cold water shock (the gasp reflex triggered by sudden immersion in cold water) causes more drowning deaths than hypothermia. Enter the water slowly and breathe deliberately through the initial cold shock.

5. Tell someone your plan. Before every swim, tell someone where you are going, how far you plan to swim, and when you expect to be back.

6. Carry a whistle. A whistle attached to your goggles can summon help if you get into difficulty.

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