2023 UltraMarathon Swim Series

The World's Coldest, Hardest, Longest, Toughest, Most Extreme Swims By, for and about ultramarathon and extreme swimmers

July: 36 km Maratona del Golfo Capri-Napoli in Italy – June 23 – June 27- July 7 – Elite Race September 9, 2023

July: Trans Tahoe in the USA – July 15, 2023

July: 32 km Traversée internationale du lac St-Jean (32 km) in Canada – July 22 – 29, 2023.

September: Travessia Lisboa – Cascais in Portugal 20km– September 23, 2023

Please view the WOWSA Rules and Regulations and 2023 UltraMarathon Extreme Swim Series rules

The Travessia Lisboa Cascais 20km Open water swimming race is a point-to-point race starting at Belém Dock in Lisbon and finishing at Pescadores Beach in Cascais, Portugal. The race includes approximately 9km in the river and 11km in the ocean, with the tide flow speeds inside the river normally greater than 1.5 m/s (5.4 km/h) and can reach 2.5 m/s (9 km/h) in the Tejo estuary and along the stunning coastline.

Race September 23, 2023

Maratona del Golfo Capri-Napoli is one of the longest running professional marathon swimming competitions in the world which began in 1954 and starts on the island of Capri and finishes 36 km (22 miles) later on Marina Grande Beach in Napoli on the mainland of Italy. Learn more

Elite Race September 9, 2023

Each summer since 1955, the Traversée Internationale du lac St-Jean attracts the world’s elite professional open water swimmers to Roberval. One of the world’s most prestigious professional races with a long and rich history.Water temperature and winds can vary, but water temperature under 20°C (68°F) is expected. Learn More

July 22 – 29, 2023

The Trans Tahoe Relay started in 1976 and has become an annual reunion of the global open water swimming community. Traditionally done as a relay, WOWSA has partnered with the Olympic Club to offer Trans Tahoe Solo (15.5k) as part of the Ultramarathon Swim Series.
July 15, 2023