Klein Bonaire is a small uninhabited coral island 800 metres off the west coast of Bonaire in the Dutch Caribbean. Largely tourist-free beaches and saline lagoons provide an ideal stop-over point for many species of migratory birds and an important breeding area for terns, notably the regionally important least tern (Sterna antillarum). The sandy beaches are also the main nesting areas of Bonaire for the critically endangered hawksbill (Eretmochelys imbricata) and the endangered loggerhead (Caretta caretta) turtles. In 2021, the Site was extended to include a 500-metre buffer zone, which covers part of the fringing reefs. With virtually every species of coral found in the Caribbean, the Site is one of the healthiest, most resilient and most biodiverse reefs in the region. Internationally threatened groupers are among the more than 340 fish species found in the reefs. Infrastructural developments at Klein Bonaire are prohibited; nevertheless the Site is an important ecotourism destination, especially for divers and snorkelers who impose a potential threat to the fragile reefs. The biggest threat however is climate change, as sea-level rise could cause the loss of the low-lying beaches and salinas.