Kaipara Harbour is a large enclosed harbour estuary complex on the north western side of the North Island of New Zealand. The northern part of the harbour is administered by the Kaipara District and the southern part is administered by the Auckland Council. The local Māori tribe is Ngāti Whātua.

Helensville is a town in the North Island of New Zealand. It is sited 40 kilometres (25 mi) northwest of Auckland, close to the southern extremity of the Kaipara Harbour. State Highway 16 passes through the town, connecting it to Waimauku 16 kilometres (10 mi) to the south, and Kaukapakapa about 12 kilometres (7.5 mi) to the north-east. Parakai is two kilometres (1.2 mi) to the north-west. The Kaipara River runs through the town and into the Kaipara Harbour to the north.