The extensive reef system is almost 700 miles long

Amazon river

400 km

400 miles

Structures

More than 50% carbonate fraction

Rhodoliths

Reef types

Sponge bottom

Atlantic Ocean

French

Guiana

Macapá

Belem

Brazil

Amazon river

Structures

More than 50% carbonate fraction

Rhodoliths

Reef types

Sponge bottom

200 km

200 miles

Atlantic Ocean

French

Guiana

Macapá

Vila Velha

Belem

Brazil