There may be hope for coral reefs.

Despite the constant hazards that have devastated coral reefs around the world, some coral communities have still managed to recover and persevere. In a study released Monday, researchers identify 38 coral “oases” that have escaped, resisted, or rebounded from the threats facing these vital marine ecosystems.

The future has often been bleak for coral reefs. Plastic pollution and overfishing threaten marine ecosystems. As climate change causes the ocean’s temperature to climb, coral reefs undergo mass bleaching events, losing the algae that they rely on for energy. Warmer waters also mean that coral-eating sea stars survive longer, lay more eggs, and cause more damage.

“Coral reefs are in rapid, global decline, but the