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Incomplete baseline data on population demographics and patterns of habitat use and the unmet need for international coordination of conservation actions are among the challenges inherent in promoting the recovery of endangered, migratory marine species. Working with field researchers, government officials and conservationists we developed a comprehensive atlas of all known sea turtle nesting grounds (n= 1311 discrete sites), including colony size and protection frameworks, in the 43 nations and territories in the Wider Caribbean Region (WCR). The majority of sites hosted extremely small colonies characterized by< 25 nesting crawls yr− 1 per species. Large nesting colonies were rare. Sites with> 500 nesting crawls yr− 1 comprised between< 1 and 8% of species-specific nesting site totals. We identified information gaps, including sites where nesting was known to occur but data were insufficient to …