Whenuapai is a suburb and aerodrome located in northwestern Auckland, in the North Island of New Zealand. It is located on the shore of the Upper Waitematā Harbour, 15 kilometres to the northwest of Auckland's city centre. It is one of the landing points for the Southern Cross telecommunications Cables.

Waitematā Harbour is the main access by sea to Auckland, New Zealand. For this reason it is often referred to as Auckland Harbour, despite the fact that it is one of two harbours adjoining the city. The harbour forms the northern and eastern coasts of the Auckland isthmus and is crossed by the Auckland Harbour Bridge. It is matched on the southern side of the city by the shallower waters of the Manukau Harbour.