Image courtesy Six Senses.

4. Six Senses Con Dao, Vietnam

The property: Located in an area that has been protected for decades as a national and marine park, Six Senses Con Dao is the first five-star resort in the archipelago islands.

Eco-friendly highlights: The resort itself was built with a very light ecological footprint, keeping in mind that right in front of the resort is one of the prime habitats for the endangered species Dugongs. In collaboration with the National Park, these marine mammals will receive enforced protection in this area.