Milford Sound is not a city but rather a fjord located in the Fiordland National Park on the South Island of New Zealand. It is a popular tourist destination known for its stunning natural beauty, including cascading waterfalls, towering cliffs, and lush rainforests. Milford Sound is often considered one of the most beautiful fjords in the world and attracts visitors from around the globe. It is part of the Te Wahipounamu World Heritage site and offers a range of activities such as boat cruises, kayaking, and hiking trails.