Forget the black line at the bottom of the pool. These stunning triathlon venues offer views of waterfalls, coral reefs, and snow-capped peaks that will make you want to stay in the water.
From mountains to white sand beaches, triathlons around the world offer stunning swim venues. (Photo: Clockwise from top left: Triathlon Magazine, Challenge Walchsee, AsDeporte, Jordan Bank/Getty Images for Ironman)
Published July 8, 2026 06:00AM
While it might be the shortest of all three triathlon disciplines, the swim is arguably one of the most important because it sets the tone for the rest of the race. So it only makes sense to pick a swim with a spectacular setting!
We’ve rounded up 10 of the most stunning triathlon swim courses across all distances. From tropical lagoons to alpine lakes, coral reefs to ocean adventures, these are some of the most beautiful and unique swim courses in the world.
Challenge Wānaka 100
February
Lake Wanaka, New Zealand
Challenge Wānaka in New Zealand provides one of the most picturesque settings for a triathlon swim. Located in the Southern Lakes region, the race takes place on the shores of Lake Wānaka beneath the snow-covered peaks of the Southern Alps.
Lake Wānaka is New Zealand’s fourth largest lake at 28 miles long, and almost 1,000 feet deep. In February, the temperature hovers around 15 degrees C (59 degrees F) so plan for the swim to be wetsuit-mandatory. But while the water is cold, it’s also pristine and crystal-clear. This glacier-carved basin is surrounded by pebble beaches, native beech forests, and towering mountains.
Challenge Wānaka recently announced a new format for 2026 with a 2K (1.2-mile) swim, 80K (49.7-mile) bike, and 18K (11.2-mile) run to total 100K. The race also offers an aquabike, a multisport event with a kayak, mountain bike, and run, a duathlon and other events the same weekend.
Ironman 70.3 Coeur d’Alene
June
Coeur d’Alene, Idaho
When you think of stunning swim settings, Idaho might not be the first place that comes to mind. However, don’t underestimate Coeur d’Alene. It’s home to one of the most beautiful triathlon swims in the Pacific Northwest.
Coeur d’Alene Lake is the second largest lake in Northern Idaho at over 26 miles long with 135 miles of shoreline. The lake is fed by the Coeur d’Alene River and the St. Joe River and is surrounded by the Coeur d’Alene Mountains, part of the Northern Rocky Mountains.
The swim course for 70.3 Coeur d’Alene is a clockwise, out-and-back design that starts at City Park Beach. Hovering right around 68 degrees F, this is almost always a wetsuit-legal swim. The water is typically calm, but it can be choppy if there’s wind on race morning. The shimmering water in this deep, clear lake is home to fish like brown trout, Chinook salmon, and black crappie that will keep you company as you begin your triathlon adventure.
The Lakesman
June
Keswick, United Kingdom
Based in Keswick, England, the Lakesman Triathlon is an athlete favorite. Given the name of this event, you can probably guess that the swim is pretty special.
The Lakesman is a half-distance triathlon, meaning athletes will complete a 1.2-mile swim, 56-mile bike, and 13.1-mile run. The swim takes place in the crystal-clear waters of Derwentwater (say that five times fast), which is known as one of the region’s most picture-perfect lakes. It’s actually called the “Queen of the Lakes.”
Picture Cumbria natural beauty with the soaring fells of Borrowdale to the south and looming Cat Bells peak to the west. The rocky shoreline is bordered by native oakwood trees and dotted with colorful wildflowers like purple foxglove and meadowsweet.
This 1.2-mile swim takes athletes on a single clockwise loop around Derwent Island, but you might want to just keep swimming.
Challenge Kaiserwinkl-Walchsee
June
Tyrol, Austria
The breathtaking backdrop of Tyrol in Kaiserwinkl is home to one of the largest triathlons in Austria. (Not to mention, it’s fun to say.) Challenge Kaiserwinkl-Walchsee has a middle-distance triathlon with a 1.9K swim, 80K bike, and 21.1K run, as well as an aquabike, aquathlon, junior challenge, family run, and women’s aquathlon.
Walchsee Lake sits at the foot of the Kaisergebirge Mountains, so the swim is surrounded by massive peaks with slopes blanketed in Norway spruce and silver fir. The lake has become a symbol of the region, and the town of Walchsee even has a blue wave on its coat of arms. Fun fact: A lido opened on the lake in 1928 and was one of the first in Austria that allowed men and women to swim together.
Not particularly deep at 21 meters (79 feet), the lake can get quite warm in the summer, up to 24 degrees C or 75 degrees F, so it’s a toss-up as to whether it will be wetsuit-legal or not. The water is crystal-clear and said to be some of the cleanest water in the Alps. With the lush alpine meadows and steep mountain cliffs, it’s a scene straight out of The Sound of Music.
Swedeman Xtreme Triathlon
July
Åre, Sweden
At an extreme triathlon, while athletes must cover a similar distance, it’s the unforgiving terrain and exposure to the elements that make these races so challenging. While many extreme triathlons have impressive swims (Norseman, Celtman, Icon Livigno), we picked Swedeman because how often do you get to exit the swim at a waterfall?
For this full-distance triathlon, athletes will board a coach bound for the remote swim start on a small beach in Nordhallen. The 3.8K swim is point-to-point, winding from Tannforsen around a peninsula and into Lake Öster-Noren. Athletes report undercurrents and temperature changes in the lake. The swim concludes once you reach Sweden’s largest waterfall, Tännforsen.
Athletes must then run up a steep 400-meter track to get to T1, which is located above the waterfall. Because the water temperature hovers around 15 degrees C (59 degrees F), wetsuits are mandatory, neoprene hats and vests are “strongly recommended,” and you may use non-webbed gloves if you like. Race management also recommends that athletes wear neoprene socks for the jog to transition, and that support crew have hot fluid waiting for their athletes in T1.
Ironman 70.3 Zell am See-Kaprun
August
Zell am See, Austria
This half-Ironman in Austria is home to a postcard-worthy swim venue. Lake Zell is crystal clear and sits at a fresh – but not bracing – 70 degrees F. Surrounded by the lush, green mountains of the Austrian Alps, Ironman 70.3 Zell am See-Kaprun has been rated as the best 70.3 in the world by athlete choice.
The 1.2-mile swim has an out-and-back design that runs parallel to the shore. Since motorboats are prohibited in Lake Zell, the water is pristine, drinking-water quality, making it perfect for swimming, paddleboarding, and sailing. Lake Zell is known as one of Europe’s cleanest lakes with visibility that sometimes extends past 30 feet.
Imagine swimming in crystal-clear, alpine water at the perfect temperature, surrounded by forests, with views of the Kitzsteinhorn glacier and Schmittenhöhe mountain. It’s so perfect you might want to call it a day and not even do the bike and run.
Hever Castle Triathlon
September
Kent, England
Kent, England, is the site of the beloved Hever Castle Triathlon. Picture starting your race on the steps of an Italian loggia with a 13th-century Tudor castle in the background. This isn’t just any castle; it was the childhood home of Anne Boleyn, the ill-fated wife of Henry VIII.
Hever Castle Triathlon has a variety of distances to choose from, including the half-distance “Gauntlet,” Olympic, sprint plus, sprint, super sprint, starter, kids’ races, duathlon, aquabike, aquathlon, and more. Because this swim is so popular, they also have three open-water swim races: 1 mile, 2.5K, and 5K.
The swim takes place in a 38-acre lake varying in depth from 3-10 feet. There might be a few lily pads to swim through, but the big draw is the garden grounds that provide a beautiful backdrop, including a unique river offshoot.
The middle-distance swim consists of a single loop, 1.9K course that goes down the lake and into the River Eden. You pass by the Japanese Tea House and wrap around Sixteen Acre Island where spectators cheer you on from the shore.
Noosa Triathlon
October
Queensland, Australia
For a beautiful beach swim, head to Queensland, Australia, for one of the biggest Olympic-distance triathlons in the world. Noosa Triathlon is much more than a race; it’s a five-day festival with 11 events hosting over 13,000 athletes. There’s an Olympic triathlon, run-swim-run, Tour de Noosa bike ride, Superkidz triathlon, special needs race, fun run, criterium, 5K road race, and celebrity triathlon.
There’s even a special swim race: the Noosa 1000 Ocean Swim. This 1K swim takes place in Laguna Bay off the spectacular, white-sand beach. The course has a unique M-shape with an Aussie exit for a short run on the sand before you hop back into the warm, turquoise waters. Water temperature stays around from 24 degrees C (75 degrees F), so be sure to pack your swimskin.
Ironman Cozumel
November
Cozumel, Mexico
Just off the coast of the Yucatan Peninsula sits a tropical paradise with a vibrant natural ecosystem. Cozumel, Mexico, has more than 14 miles of reefs, archaeological ruins, a national park, white sand beaches, and turquoise waters. It’s also the home of Ironman Cozumel and one of the fastest swims on the Ironman circuit.
The 2.4-mile swim takes place in the protected Cozumel Reefs National Park. Known for spectacular visibility and underwater sea life, the swim course is point-to-point parallel to the shore. Because of the strong directional current, this is typically a very fast swim. Also, the saltwater will help with buoyancy, which is good because at 25.5 degrees C/78 degrees F, this swim isn’t wetsuit legal.
Despite the warm temperature, the bright blue waters of the Caribbean make you feel like you’re swimming in a living aquarium, surrounded by colorful fish and coral.
Xterra Tahiti
November
Moorea, Tahiti
Set in the warm waters of Opunohu Bay, the swim at XTERRA Tahiti is an athlete favorite because of the spectacular setting in the South Pacific paradise of Moorea. XTERRA Tahiti has a full-distance triathlon with a 1.5K swim, 34K bike, and 10K run, as well as a sprint, super sprint, and a kid’s duathlon.
The full-distance triathlon begins with an early morning boat ride to Moorea. Athletes are taken by pirogue (outrigger canoe) to the middle of the lagoon. From there, you will swim 1,500 meters to the shore. This race has lovely local support, and you might see horses and riders bedecked with palm frond headdresses greeting you at the swim exit.
Against a dramatic backdrop of towering volcanoes, dense jungle, and sparkling turquoise water, swimming in Opunohu Bay is like a scene out of a movie.
