Milford Sound is a fiord in the southwest of New Zealand’s South Island. It’s known for towering Mitre Peak, plus rainforests and waterfalls like Stirling and Bowen falls, which plummet down its sheer sides. The fiord is home to fur seal colonies, penguins and dolphins. Milford Discovery Centre and Underwater Observatory offers views of rare black coral and other marine life. Boat tours are a popular way to explore.