interesting facts

Ten amazing facts about coral reefs

By Tyler Stiem

Photo: Guido Borgenon/Guylian Seahorses of the World

Photo: Guido Borgenon/Guylian Seahorses of the World

As we prepare for our expedition to Danajon Bank double barrier reef in the Philippines, we’ll be sharing some key facts and stats about corals, coastal habitats, and conservation. Here are 10 amazing things you probably didn’t know:

500 million

Number of people who live near coral reefs and depend on them for food, livelihoods, and well-being.

30 billion

Value, in US dollars, of coastline protection, tourism, and food provided by coral reefs every year.


Average number of lives saved per coastal village during India’s 1999 “supercyclone,” thanks to the wave-dampening effects of mangroves and coastal marine habitats. 


Proportion of the world’s fisheries yields that come from waters less than 200 m deep.


Proportion of coral reefs that have been degraded or destroyed globally.


Number of marine reserves in the world, for a total of 4.2 million square kilometers, as of 2010.


Proportion of our oceans protected by marine reserves.

135 km

Length of Danajon Bank, a rare and threatened double-barrier reef in central Philippines, and the focus of our expedition. The total area of the reef is 234,950 sq hectares.


Number of threatened species that depend on Danajon Bank for their survival.


Number of marine protected areas established on Danajon Bank by expedition partner Project Seahorse in collaboration with local communities.

Help us protect Danajon Bank and send an ocean conservation message to the world! You can receive gorgeous, gallery-quality photo prints, a book about the expedition, postcards, and much more in exchange for your support.