Answer: barrierreef

AnswerCrossword Clue
BARRIERREEFLagoon border
BARRIERREEFUnderwater coral collection
BARRIERREEFGreat ..., in the Coral Sea
BARRIERREEF"Great" Australian landmark
BARRIERREEFShoreline protector
BARRIERREEFAlong with the shore, this forms a lagoon
BARRIERREEFOffshore coral ridge