Northport is a commercial sea port at Marsden Point, at the entrance to the Whangarei Harbour in Northland, New Zealand, located next to the Marsden Point Oil Refinery. It is a naturally deep-water port, with a maximum depth of 14.5 metres. It is the northernmost multi-purpose port in New Zealand, and the closest port to the majority of New Zealand's international markets. It is about 100 km north of the Auckland Northern Motorway, and around 75 nautical miles north of the Port of Auckland.