Port Adelaide is a suburb of Adelaide

Adelaide

Adelaide is the capital city of South Australia and the fifth-largest city in Australia. Adelaide has an estimated population of more than 1.2 million...

 lying about 14 kilometres northwest of the City of Adelaide

City of Adelaide

The City of Adelaide is a local government area in the metropolitan area of Adelaide, South Australia. It covers the original Adelaide city centre settlement, , North Adelaide, and the Adelaide Park Lands which surround North Adelaide and the city centre.Established in 1840, the organisation now...

. It lies within the City of Port Adelaide Enfield

City of Port Adelaide Enfield

The City of Port Adelaide Enfield was established on 1 January 1997 by the amalgamation of the City of Port Adelaide and the City of Enfield, and is one of the larger metropolitan councils within South Australia....

 and is the main port

Port

A port is a location on a coast or shore containing one or more harbors where ships can dock and transfer people or cargo to or from land....

 for the city of Adelaide. Port Adelaide played an important role in the formative decades of Adelaide and South Australia, with the port being early-Adelaide's main supply and information link to the rest of the world.
Prior to European Settlement Port Adelaide was covered with mangrove

Avicennia marina

Avicennia marina, commonly known as grey mangrove or white mangrove, is a species of mangrove tree classified in the plant family Acanthaceae...

 swamps and tidal mud flats, and lay next to a narrow creek.