The Cham Islands in Tan Hiep Commune are recognised as a UNESCO Biosphere Reserve.
These were the first islands in Vietnam to reveal a rich coral system with over 300 species.
Tourists must take a canoe to authorised diving locations. Depending on the type, coral diving costs VND150,000-950,000 (USD5.89-37.32) each.
Noon or the afternoon is often the best time for coral diving, as the clear sea water allows people to see the coral better.
Visitors to Cham Islands play a crucial role in preserving the environment by adhering to local regulations, such as refraining from using plastic bags and littering.