Conserving Chagos: Science Expedition to World s Largest "Ocean Park"

Join Our Community of Science Lovers!

This article was published in Scientific American’s former blog network and reflects the views of the author, not necessarily those of Scientific American


Vast coral reefs, hundreds of fish species, hundreds of thousands of pairs of breeding seabirds, a refuge and breeding ground for large, critically important marine species such as sharks, dolphins, and green and hawksbill turtles: I am describing the Chagos Archipelago, one of the most remote and unspoiled marine areas on the planet. I’m here with a team of scientists and conservationists to study its extraordinary marine environment.

Located in the middle of the Indian Ocean, the Chagos Archipelago is comprised of 55 islands and vast coral reefs. At 210,000 square miles (544,000 square kilometers), the islands and surrounding waters cover an area larger than France and more than 60 times the size of Yellowstone National Park in the United States.

It is also a place that, almost two years ago this April, became the largest marine reserve – or “ocean park” – in the world. With such high protection, Chagos is now a safe refuge and breeding site for a wide variety of critically important marine life.


On supporting science journalism

If you're enjoying this article, consider supporting our award-winning journalism by subscribing. By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today.


Our science expedition is the first to the area since its designation as a marine reserve. As we will detail in a series of posts on this site, we’ll be diving into the Chagos’ waters to better understand the health of its coral reefs and various fish populations. We’ll be studying several of the archipelago’s islands, in particular its bird populations, which makes for a truly magical place.

Professor Charles Sheppard with the University of Warwick in the UK has led several scientific research expeditions to the Chagos Archipelago. Following early visits in the 1970s, expeditions he has organised since 1996 have involved over 100 scientists from numerous institutions, chosen to produce an integrated understanding of this archipelago. His speciality is the condition of coral reefs, especially those around the world that have suffered from human impacts. This specialization quickly led to recognition of the contrasting, remarkable, and unique condition of the huge area of reefs in Chagos: Chagos has escaped most of the impacts that have affected most of the world.

More by Charles Sheppard

It’s Time to Stand Up for Science

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in that two-century history.

I’ve been a Scientific American subscriber since I was 12 years old, and it helped shape the way I look at the world. SciAm always educates and delights me, and inspires a sense of awe for our vast, beautiful universe. I hope it does that for you, too.

If you subscribe to Scientific American, you help ensure that our coverage is centered on meaningful research and discovery; that we have the resources to report on the decisions that threaten labs across the U.S.; and that we support both budding and working scientists at a time when the value of science itself too often goes unrecognized.

In return, you get essential news, captivating podcasts, brilliant infographics, can't-miss newsletters, must-watch videos, challenging games, and the science world's best writing and reporting. You can even gift someone a subscription.

There has never been a more important time for us to stand up and show why science matters. I hope you’ll support us in that mission.

Thank you,

David M. Ewalt, Editor in Chief, Scientific American

Subscribe