What Happened to West African Coral Reefs?

For decades, the status of coral reefs along the West African coastline remained largely unknown, with many deep-water formations presumed dead or non-existent due to a lack of extensive scientific exploration and the global decline in coral health. Initial surveys in the 1960s off the continental shelf of Benin and Togo had hinted at the presence of coral structures, but these findings were dismissed, and the reefs were subsequently forgotten.

The primary reasons for this historical oversight include the challenging conditions of deep-sea exploration, limited funding for marine research in the region, and a prevailing assumption that West African waters, particularly the Gulf of Guinea, were not conducive to diverse coral ecosystems. This perception was exacerbated by the global trend of coral reef degradation, with over 50% of the world's coral reef area lost since the 1950s due to mass bleaching events, overfishing, and pollution.

A key turning point emerged in 2021 when Gérard Zinzindohoué, a researcher at Benin's Institute for Fisheries and Oceanological Research (IRHOB), became inspired to investigate the possibility of living reefs in Benin after observing corals in Cape Verde. His persistence led to securing a $20,000 National Geographic Explorers grant in January 2025, which funded the Coral Reefs Rediscovering and Exploration project in Benin (COREB). Between April and December 2025, the COREB team conducted exploratory marine surveys using advanced sonar mapping and underwater drone technology.

The most significant development occurred in July 2026, when the COREB expedition successfully rediscovered the long-lost coral reef off Benin. Using sonar to identify potential hard-bottom structures and then deploying underwater drones with high-definition cameras, researchers found a healthy mesophotic coral ecosystem (MCE) thriving more than 50 meters (175 feet) below the surface. This MCE, which requires light but exists at deeper depths than typical shallow reefs, was found to host at least eight different coral types and eight fish species, including golden African snappers and Guinean angelfish. The findings were published in Frontiers in Marine Science on July 19, 2026.

As of July 21, 2026, the rediscovered Benin-Togo reef is a vibrant, thriving ecosystem, challenging the notion that all such reefs in the region were dead. This discovery has sparked immense optimism within the scientific community, highlighting the potential for other undocumented deep-water coral ecosystems along the West African coastline. Researchers are advocating for its full protection, potentially through the establishment of a marine protected area, and an application to designate it an Important Shark and Ray Area is underway. Broader West African coral reefs, including cold-water coral communities found off Ghana, Mauritania, and Ivory Coast, continue to face threats from rising ocean temperatures, ocean acidification, pollution, overfishing, and offshore oil and gas exploration. However, there is a growing regional commitment to marine conservation, exemplified by Côte d'Ivoire's announcement in June 2026 to establish six new Marine Protected Areas by 2030, and a joint initiative by The Gambia, Mauritania, Guinea Bissau, and Senegal to create a regional MPA and advocate for high seas protection in the Eastern Atlantic.