Answer: barrierreef

AnswerCrossword Clue
BARRIERREEF

Lagoon border

BARRIERREEF

Underwater coral collection

BARRIERREEF

Great ..., in the Coral Sea

BARRIERREEF
"Great" Australian landmark
BARRIERREEF
Shoreline protector
BARRIERREEFAlong with the shore, this forms a lagoon
BARRIERREEFOffshore coral ridge