Achaia Cave Travel Guide

Achaia Cave, or Gruta do Acaia, is a natural wonder located near Praia Vermelha on Ilha Grande, Angra dos Reis. This mesmerizing sea cave is renowned for its unique geological formations and the ethereal, turquoise light that illuminates its interior.To enter the cave, visitors descend through a narrow opening, about 10 meters, which requires some crawling and can be challenging for those with claustrophobia or mobility issues. Inside, sunlight streams through an underwater passage, creating a stunning display of fluorescence on the cave walls and water. The effect is a turquoise-green glow, with lights that flicker and sparkle like diamonds.The cave itself is relatively small, but the experience is unforgettable. The play of light and shadows, combined with the sound of the waves, creates a unique and magical atmosphere. The surrounding area is also rich in biodiversity, offering opportunities for nature walks and birdwatching.According to local legend, the name 'Vermelha' (Red) for the nearby beach comes from the indigenous people who made bonfires on the beach, turning the sand red. Another story suggests it's from the whaling era when the beach was used to butcher whales, staining the water red with blood.