Reef Behind Barrier Reef

Scientists have discovered a vast reef behind the familiar Great Barrier Reef, unveiling great fields of unusual donut-shaped circular mounds, each 200-300 metres across and up to 10 metres deep.

Scientists have discovered a vast reef behind the familiar Great Barrier Reef, unveiling great fields of unusual donut-shaped circular mounds, each 200-300 metres across and up to 10 metres deep.