Amazon River
400 km
400 miles
Structures
More than 50% carbonate fraction
Rhodoliths
Reef types
Sponge bottom
Atlantic Ocean
French
Guinea
Macapá
Belem
Brazil
Amazon River
Structures
More than 50% carbonate fraction
Rhodoliths
Reef types
Sponge bottom
200 km
200 miles
Atlantic Ocean
French
Guinea
Macapá
Vila Velha
Belem
Brazil