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Two-thirds of Australia's Great Barrier Reef showed the largest amount of coral cover in 36 years.

The reef still remains vulnerable to increasingly frequent mass bleaching, however, an official long-term monitoring programme reported on Thursday.

The recovery is in the central and northern stretches of the UNESCO world heritage-listed reef.

It is contrasted with the southern region, where there was a loss of coral cover due to crown-of-thorns starfish outbreaks, the Australian Institute of Marine Sciences (AIMS) said in its annual report.