The NAPO Swim Cup 5 km is an open-water swim in the Bay of Ajaccio, starting from Trottel Beach in Corsica. GFCA Natation organizes the event with support from the City of Ajaccio and the Corsican Swimming League. It is part of a larger race day that begins in the morning, with multiple waves of swimmers participating in the bay.
The 5 km races have water-themed names like Waterl'eau, Moskov'acqua, and Berezin'acqua. Approximately 200 swimmers compete in the program, with participants from France and other European countries. The event also includes a 10 km marathon swim, 1.5 km races, and a 500 m short distance, attracting both competitive open-water swimmers and those seeking a shorter, more accessible option.