Circuito Mares — Ubatuba (Praia da Enseada)

In 1563, the Jesuit priest José de Anchieta was held as a hostage in the village of Iperoig, a pivotal event that led to the Peace of Iperoig and secured colonial control over the region. Today, the waters of Ubatuba bear little resemblance to that era of political tension, offering instead a serene, protected arena for the Circuito Mares. When you line up at Praia da Enseada for the 2026 edition, you are swimming in a region where historical intrigue meets a highly preserved marine environment.

Nature and landscape

The course is defined by the dramatic silhouette of the Serra do Mar mountains, which rise sharply from the coastline. With over 80% of the municipality blanketed by the Atlantic Forest, the view from the water is a dense, green wall that contrasts sharply with the deep blue of the South Atlantic. As you navigate the buoys, keep an eye out for the local sea turtles. Ubatuba hosts a vital base for the Projeto TAMAR, and these reptiles are frequently spotted patrolling the same coastal currents that will guide your stroke.

Geographical anomalies

Swimming here puts you in a rare position regarding the earth’s alignment. The Tropic of Capricorn passes directly through the municipality, physically crossing the local airport runway near the coast. This geographical milestone is a unique constant for athletes, marking a distinct latitude that few open water races can claim. While your focus will be on the competition, the environment remains deeply connected to traditional cycles, such as the annual migration of the Tainha (mullet) fish, which historically dictates the rhythm of the local fishing communities.

Race day logistics

This stage of the Circuito Mares is a marquee event, drawing swimmers who value both technical challenge and ecological context. The entry fee covers essential logistics, including specialized timing chips and a high-visibility swimming cap, ensuring safety and precision in an area characterized by the transition between tropical and warm temperate marine zones. For those seeking a longer challenge in these same currents, the Aquamundo Ilha Anchieta 2026 offers a different perspective on the local topography just five months prior. Whether you are navigating the ruins of the Fazenda do Bom Retiro at nearby beaches or focusing on the buoy line, the race provides a direct encounter with one of Brazil’s most significant coastal landscapes.