Fiordland National Park, scenic natural area in the southernmost part of South Island, New Zealand. Established as a reserve in 1904, it was designated a national park in 1952. It covers an area of some 4,600 square miles (12,000 square km), making it one of the largest national parks in the world. Fiordland, along with nearby Mount Aspiring, Mount Cook, and Westland national parks, collectively constitute Te Wahipounamu (South West New Zealand), which was named a UNESCO World Heritage site in 1990. The park is renowned for the rugged grandeur of its fjords (fiords), mountains, forests, waterfalls, and lakes, including