A barrier reef is a coral reef that is far from land.

Barrier Reef

A barrier reef is a coral reef that is far from land.

Diagram illustrating the conversion of a fringing into a barrier reef by subsidence.

Barrier Reef

Diagram illustrating the conversion of a fringing into a barrier reef by subsidence.

Diagram illustrating the conversion of a barrier reef into an atoll.

Barrier Reef

Diagram illustrating the conversion of a barrier reef into an atoll.