The average water depth across the Gulf of Thailand is just 45 metres, one-third of the depth of the English Channel.
The marine section of Phu Quoc National Park is home to the elusive dugong, which is close to extinction.
It can take tens of thousands of years for a single section of coral reef to grow.
The Phu Quoc ridgeback dog is a characteristic sub-species with very large teeth and a 3cm ridge of fur along its back.
Every year, Phu Quoc produces enough fish sauce to fill over 30 Olympic-sized swimming pools.
Phu Quoc National Park covers more than 70% of the island and an area roughly the size of the Isle of Wight.