Which Brazilian archipelago is a UNESCO World Heritage site known for its clear waters and marine life?

Fernando de Noronha is the Brazilian archipelago recognized as a UNESCO World Heritage site for its clear waters and exceptional marine life.

Located about 350 kilometres off Brazil’s northeastern coast, the archipelago consists of 21 islands and islets, although only the main island is permanently inhabited. Its volcanic seascape includes beaches, rocky coastlines, reefs and underwater habitats with unusually clear visibility.

UNESCO designated Fernando de Noronha together with the nearby Rocas Atoll as a World Heritage site in 2001. The area is important as a feeding ground for tuna, sharks, sea turtles and marine mammals, and it supports a notable population of spinner dolphins. Much of the archipelago is protected through a marine national park and an environmental protection area.

The main mix-up is with other famous tropical destinations such as the Maldives, Seychelles and Galápagos. Those places also have clear water and rich marine ecosystems, but Fernando de Noronha is the Brazilian archipelago described in this question.