Invasão da Ilha Grande

The Invasão da Ilha Grande challenges participants with a 10,000-meter course set in the waters of Angra dos Reis, Rio de Janeiro. Organized annually by MASF (Maratona Aquática Sem Fronteiras), the event is scheduled for August 23, 2026. This long-distance open water test requires a high level of preparation, as the route navigates the maritime corridors surrounding one of Brazil's most historic island landscapes. For those seeking shorter formats, the Colégio Naval event held a day prior provides a technical alternative in the same region, while athletes looking for a similar endurance test can consider the Fuga da Ilha Grande in November.

A landscape of confinement and conflict

Swimming here means moving through waters that served as a backdrop for both tactical maneuvers and isolation. As you traverse the coastal stretches, the history of the Ilha Grande becomes tangible. The island hosted the Lazareto, a quarantine center established by Emperor Dom Pedro II in 1863; even today, you can spot the 'Banco de D. Pedro' near the old dam, a stone marker where the monarch once rested. The intensity of this environment is further reflected in the infamous 1986 prison break, where a trafficker known as 'Escadinha' escaped the Cândido Mendes facility by helicopter, fleeing directly across the bay. These waters were not always peaceful, as evidenced by the 1591 raid led by privateer Thomas Cavendish, who looted and burned local settlements before continuing his voyage.

This UNESCO World Heritage site demands respect for its natural and historical legacy. Beyond the deep-water channels, you might glimpse the distinct silhouette of the Pico do Papagaio or spot marine life, including sea turtles, navigating the protected ecosystem. The legacy of the Tamoio people, who once defended these shores, still informs the local identity, as does the literary documentation left by prisoners like Graciliano Ramos, who were held at the island’s penitentiary. The 10km distance is a significant undertaking, mirroring the grit of the 2001 record-setting non-stop island circumnavigation by runners Carlos Sposito and Giovanni Mello, a feat that remains standing to this day. The logistical complexity of managing such a course—ensuring safety across wide channels and island peripheries—explains the focused, professional approach maintained by the organizing team.