CEADS Naval Reserve

The Centro de Estudos Aplicados ao Desenvolvimento Sustentável (CEADS) is a Brazilian Navy research station on Ilha Grande whose surrounding reefs have been closed to tourism for decades, creating one of the most pristine reef ecosystems on the southeast Brazilian coast. Completely free of fishing and recreational pressure, the reef communities here have recovered to structural complexity and fish biomass rarely seen elsewhere in the region. Access is tightly controlled and limited to research-affiliated groups, making every dive here a genuinely rare scientific and experiential privilege.