The ocean became dangerously warm between 2023 and 2025 due to a strong El Niño. This caused a massive coral bleaching event, damaging about 84 percent of coral in at least 83 countries. It was the fourth global bleaching crisis and the second in only ten years. Many thought the colorful underwater ecosystems would disappear.
However, researchers from the Wildlife Conservation Society and Macquarie University have found a large, hidden network of coral reefs that can resist climate change. After studying over 45,000 surveys from 1960 to 2025 and analyzing ocean data, they identified 165,922 square kilometers of strong, lasting reefs. This area, found in 71 countries, is three times larger than previously thought.
Dr. Emily Darling of the Wildlife Conservation Society mentioned that people often see these ecosystems as lost. But, this new information shows a global group of reefs with the real ability to survive the climate crisis. These resilient corals now make up about one-third of all reef ecosystems worldwide. They survive using three main strategies: living in cooler water pockets, having special genetic traits to tolerate heat, or recovering quickly after disasters like cyclones.
Finding these survivors needed great accuracy. The team used a mapping tool much more precise than older ones. They found that 61 percent of these hardy reefs are in the waters of Australia, the Bahamas, Cuba, Indonesia, and the Philippines. The map also showed new safe areas in the Caribbean, near Belize, Panama, and the Turks and Caicos Islands.
This research builds on the 2018 "50 Reefs project." The new study includes 30 more countries and 54 extra territories. These ecosystems are vital, supporting a quarter of all marine life and providing food and economic benefits to nearly one billion people. Scientists shared this discovery on June 16, 2026, at the 11th Our Ocean Conference in Mombasa, Kenya, launching a campaign called "Our Reefs, Our Future." They are asking governments to protect these resilient zones to meet a global goal of safeguarding 30 percent of nature by 2030. Currently, less than a third of these reefs have legal protection. However, momentum is growing, with more countries joining a climate-resilient coral reef commitment.