The port of Hong Kong is a deep water port located in southern China. It is one of the hub ports serving the South-East and East Asia region, and is a gateway to mainland China. The city of Hong Kong began as a colony of the United Kingdom. It was a free port, and became an international trade center connecting land and sea transport between China and other countries. The port has mature infrastructure and well-developed air-sea-land transport. It helps Hong Kong maintain its position on international trade centre and transshipment hub.