This report is a map-based analysis of threats to coral reefs around the world, with particular focus on the countries of the Coral Triangle—Indonesia, Malaysia, Papua New Guinea, the Philippines, Solomon Islands, and Timor-Leste. It examines present pressures on coral reefs, including overfishing and destructive fishing, coastal development, and pollution from land and sea, as well as projected threats from climate-related ocean warming and acidification. It also studies the social and economic vulnerability of countries to reef loss and examines existing management efforts.