A mother and daughter discover the world’s largest coral colony
The structure measures more than 350 feet in length, and covers around 40,000 square feet. Its location has been kept secret to protect it.
Late last year, a mother-daughter team identified the largest coral colony ever documented, in a discovery made on Australia’s Great Barrier Reef. Jan Pope, an underwater photographer and seasoned diver, spotted an unusual structure beneath the surface and decided to return to the area with her daughter, Sophie Kalkowski-Pope, marine operations coordinator for the conservation group Citizens of the Reef, to investigate further.
When they returned with surveying equipment, they confirmed they had uncovered something historic. The find is a J-shaped Pavona clavus coral spanning approximately 40,000 square feet and stretching 365 feet in length, roughly the size of a soccer field. The colony is so vast that it took Kalkowski-Pope three uninterrupted minutes of swimming to film it from one end to the other.
3D technology and a secret location
To verify its dimensions, the team combined measurements collected manually underwater with high-resolution imagery captured from the surface. Using the full dataset, researchers have created a three-dimensional spatial model that will allow them to monitor the coral’s development over time. However, to protect the site from potential damage and limit human impact, the organization has chosen to keep its exact location under tight wraps.
Scientists are now investigating why this massive colony has thrived in that particular part of the reef. Early findings suggest the area benefits from strong tidal currents and limited exposure to tropical cyclones, creating a far more stable environment for growth than many other sections of the reef.
@sophie_dives Three minutes to swim from one side of a coral colony to the other?! So excited to share a bit more behind the scenes foortage from the first time mum and I were exploring this site together The largest coral colony on the Great Barrier Reef, and quite possibly the largest coral in the world. Discovered during the Great Reef Census by Citizens of the Reef #citizenscience @citizensofthereef
♬ aquatic ambience - slowed + reverb - Scizzie
Resilience in the dace of climate change
The emergence of this giant coral structure offers a rare glimmer of hope amid the ongoing crisis affecting marine ecosystems. Its remarkable condition shows that there are still pockets of the ocean where coral species can withstand the pressures of a warming planet. That is no small feat considering that record-high ocean temperatures have left more than 80% of the world’s reefs affected by mass coral bleaching since 2023. During bleaching events, excessive heat causes corals to expel the symbiotic algae living within them, cutting off a vital source of nourishment and threatening their survival.
The Popes’ discovery was far from a stroke of luck. It is the product of the extensive work carried out by Citizens of the Reef, an initiative that brings together more than 100 vessels and thousands of volunteers to map the seafloor. Their efforts underscore the growing importance of citizen science as a critical tool, helping researchers better understand and protect some of the planet’s most fragile marine ecosystems.
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