Describe Your Event

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An Ultra-Swim is a new category of open water event, defined as a multi-day timed swim challenge, with a total distance of at least 33.3km – the theoretical shortest distance of the English Channel. With 5 to 6 timed swims over 4 days it is tough enough to push swimmers out of their comfort zone, but accessible enough for any competent open water swimmer.

Multiple swim distances and formats, in varied open water conditions, supported by host of professional services, from a premium base on a point to point course. Includes a 10km marathon swim, a night swim ‘taster’, and both fjord and open water legs in the case of the 2022 Invitational Test Event.

The Ultra-Swim 33.3 Series will include events all over the world, and will launch fully in 2023.

You are invited to join this first Invitation only event in Montenegro, a stunning and relatively unknown open water swimming destination, that combines both steep side fjord type swimming, with the turquoise waters of the Adriatic, in water temperatures (20-22C) that don’t oblige a wetsuit (although they are permitted).

This first 33.3 event is an invitational one, with just 33 swimmer spots planned – compared with the full events in the future that will be for 200-400 according to the venue. It is your chance to experience this new UltraSwim 33.3 event format, and through your inputs be part of moulding the future event series. Whilst it is certainly premium priced, we are subsidising significantly this year to ensure that we can provide all the premium services we plan for the full events in the future, yet without the economies of scale.



Distances Offered

Over 10k





Swim Type


Water Type