北京条約
In 1860, the colony was extended with the addition of the Kowloon peninsula and in 1898, the Second Convention of Peking further expanded the colony with the 99-year lease of the New Territories. In 1984, the governments of the United Kingdom and the People's Republic of China (PRC) concluded the Sino-British Joint Declaration on the Question of Hong Kong, under which the sovereignty of the leased territories, together with Hong Kong Island and Kowloon (south of Boundary Street) ceded under the Convention of Peking (1860), was transferred to the PRC on 1 July 1997.