The Six-Gun Battery is a 19th-century fort situated at the entrance of the River Gambia in Banjul, constructed by the British in 1816 to enforce the abolition of the transatlantic slave trade following the 1807 Slave Trade Act. This defensive structure, equipped with artillery, served to intercept illegal slave ships before being decommissioned in 1870. Recognized for its historical significance, it was designated a UNESCO World Heritage Site in 2003 as part of Kunta Kinteh Island and Related Sites, reflecting its role in Gambia's colonial and anti-slavery history.