Swimmers in the long race are transported by boat to Club Náutico Dos Mares before swimming 4,500 meters across the Mar Menor to Club Náutico Los Nietos. The Travesía por el Mar Menor is a Saturday-morning open-water swim based in Los Nietos, Cartagena, with a shorter 1,500-meter option that starts and finishes at the same club.
The field is open to federated and non-federated swimmers from age 14, with categories running through Master 5 for swimmers over 69. Both races conclude at Club Náutico Los Nietos, where swimmers collect caps, regroup after the competition, attend the awards ceremony, and share a participant meal. This event is in its third edition, suggesting a local swim focused on the Mar Menor and its yacht clubs rather than a large, established race.