深圳河
Under the convention the territories north of what is now Boundary Street and south of the Sham Chun River, and the surrounding islands, later known as the "New Territories" were leased to the United Kingdom for 99 years rent-free, expiring on 30 June 1997, and became part of the crown colony of Hong Kong. The Kowloon Walled City was exempt and remained under the control of Qing China. The territories which were leased to the United Kingdom were originally governed by Xin'an County, Guangdong province. Claude MacDonald, the British representative during the convention, picked a 99-year lease because he thought it was "as good as forever". Britain did not think they would ever have to give the territories back. The 99-year lease was a convenient agreement.