A new global study has identified 165,922 square kilometers (64,000 square miles) of climate-resilient coral reefs that may be capable of surviving and, in some cases, recovering from the growing impacts of climate change. The finding, published by researchers from the Wildlife Conservation Society and Macquarie University, suggests that resilient coral habitats are three times more widespread than previously estimated, offering a rare source of optimism as coral ecosystems face unusual heat stress worldwide.

The study arrives after one of the most damaging periods for coral reefs on record. Between 2023 and 2025, a powerful El Niño event combined with record ocean temperatures exposed nearly 84% of the world’s coral reef area to bleaching-level heat stress across at least 83 countries and territories. The event became the fourth global mass coral bleaching episode ever recorded and the second in just a decade.

Largest Assessment of Reef Resilience to Date

Researchers analyzed more than 45,000 coral reef surveys alongside decades of oceanographic and climate records to identify reef systems that have shown the ability to withstand environmental stress and maintain ecological function.

The analysis mapped resilient reef habitats across:

• 71 countries
• 100 territories and jurisdictions
• 165,922 sq km of reef ecosystems

Many of these locations had never previously been assessed for climate resilience.

According to study co-author Emily Darling of the Wildlife Conservation Society, the findings challenge the narrative that coral reefs are beyond saving.

“Coral reefs are often framed as ecosystems beyond saving. Our research shows that there are three times more reefs that may be capable of surviving the climate crisis than previously thought,” she said.

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Where Are These Resilient Reefs Located?

The study found that 61% of all identified Climate-Resilient Coral Reefs are concentrated in just five countries:

Researchers say these regions could become priority areas for conservation investments and climate adaptation strategies.

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A Major Conservation Gap

While the findings are encouraging, the study also revealed a significant challenge. Less than 28% of the identified resilient reefs currently fall within protected or conserved marine areas.

That means approximately 119,605 square kilometers of potentially climate-resilient reef habitat remain exposed to threats such as:

• Water pollution
• Unsustainable fishing practices
• Coastal development
• Tourism-related degradation

The authors describe this unprotected majority as one of the clearest opportunities for advancing the Kunming-Montreal Global Biodiversity Framework, which aims to conserve at least 30% of terrestrial and marine ecosystems by 2030 under the global “30×30” target.

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Why the Findings Matter

The timing of the study is significant. According to the Global Coral Reef Monitoring Network, the world has already lost approximately 14% of its coral cover since 2009.

Coral reefs support at least 25% of all marine species, despite covering less than 1% of the ocean floor. They also provide ecosystem services valued at up to $9.9 trillion annually, supporting fisheries, tourism, coastal protection, and biodiversity. Scientists caution that the discovery of resilient reefs does not reduce the urgency of cutting greenhouse gas emissions. Instead, it helps identify where conservation efforts may have the greatest chance of success.

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