What is NZ deepest harbour?

New Zealand's deepest harbour is the Milford Sound, located in the Fiordland National Park on the South Island. It reaches a maximum depth of about 420 meters (1,378 feet), making it not only the deepest harbour in New Zealand but also one of the most stunning natural attractions in the country. The sound is renowned for its dramatic cliffs, waterfalls, and wildlife, drawing tourists from around the world.