Serranilla is a partially submerged reef that is occupied and administered by Colombia. Located 220 miles northeast of Nicaragua and 170 miles southwest of Jamaica, Serranilla was discovered by Spain in 1510, while it was an atoll. The British Royal Navy used Serranilla as a fort during the Golden Age of Piracy, defending British Honduras against Spanish and pirate attacks. In September 1719, the fort was seized by Edward Kenway's pirate crew, and it remained a pirate haven until the end of the era. The island became the subject of dispute during the 19th century; it became a part of Colombia, but the United States declared its annexation in 1879 due to its guano resources, and Honduras, Nicaragua, and Jamaica would also claim the reef.