Linked from
The 7 pages that link to Barrier reef, each with the reason it gives.
AtollRelated: It can develop as a volcanic island subsides and its reef continues growing upward.
Mesoamerican Barrier Reef SystemNarrower topic: The system is a regional example of this reef form.
Coral islandRelated: It is an intermediate reef form in the subsidence sequence leading to an atoll.
Chuuk LagoonNarrower topic: The outer reef forms much of the lagoon’s protective boundary.