Turneffe Atoll is located southeast of Ambergris Caye and Caye Caulker, off the coast of Belize in Central America, 20 miles (32 kilometres) from Belize City. It is one of three atolls of the Belize Barrier Reef, along with Glover’s Reef and Lighthouse Reef. It is approximately 30 miles (48 kilometres) long and 10 miles (16 kilometres) wide, making it the largest coral atoll in Belize and in the Mesoamerican Barrier Reef System. The atoll was officially declared a marine reserve on November 22, 2012.