Ap Lei Chau or Aberdeen Island is an island of Hong Kong, located off Hong Kong Island next to Aberdeen Harbour and Aberdeen Channel. It has an area of 1.30 square kilometres (0.50 sq mi) after land reclamation. Administratively it is part of the Southern District. Ap Lei Chau is one of the most densely populated islands on earth, as well as the most densely populated island with a population of over 10,000.

Hong Kong Island is an island in the southern part of Hong Kong. The island, known originally and on road signs simply as "Hong Kong", had a population of 1,289,500 and a population density of 16,390 per square kilometre (42,400/sq mi), as of 2008. The island had a population of about 3,000 inhabitants scattered in a dozen fishing villages when it was occupied by the United Kingdom in the First Opium War (1839–1842). In 1842, the island was formally ceded in perpetuity to the UK under the Treaty of Nanking and the City of Victoria was then established on the island by the British Force in honour of Queen Victoria. The Central area on the island is the historical, political and economic centre of Hong Kong. The northern coast of the island forms the southern shore of the Victoria Harbour, which is largely responsible for the development of Hong Kong due to its deep waters favoured by large trade ships.