Manukau Harbour is a large estuarine harbour located on the west coast of Auckland, New Zealand. It covers an area of approximately 310 square kilometers and is known for its rich biodiversity, including various bird species and marine life. The harbour is fed by several rivers, including the Auckland region's Waiuku River and Tamaki River. The harbour is surrounded by several suburbs and towns, providing recreational opportunities such as fishing, boating, and birdwatching. It is also significant for its cultural heritage, with historical connections to the Māori people, who have lived in the area for centuries.