What port did Britain take control of during the opium wars?

During the Opium Wars, Britain took control of the port of Hong Kong. Following the First Opium War (1839-1842), the Treaty of Nanking ceded Hong Kong Island to Britain in 1842, establishing it as a significant trading post and colonial territory. This control was further solidified with the Second Opium War, which led to the expansion of British influence in the region.