Photographer Paul Hilton spent time aboard the environmental advocacy organization's ship, Rainbow Warrior, to document the country's incredible ecosystem, including some breathtaking underwater shots of whale sharks and a coral reef.
The IDB was established by the United Nations in 1993 to raise awareness about biodiversity and conservation efforts. Each year has been themed, including this year's "Water & Biodiversity," meant to highlight the decreasing availability of freshwater around the world, Secretary-General Ban Ki-moon wrote in a statement.
Take a look at some of the incredible shots Hilton took below:
More:United Nations Biodiversity Un Biodiversity International Biological Diversity International Day For Biological Diversity 2013
The Morning Email helps you start your workday with everything you need to know: breaking news, entertainment and a dash of fun. Learn more