We need you to answer this question! The park is part of Te Wahipounamu , a UNESCO World Heritage site. Dykstra's (2012) work on Milford Sound shows the extent - 4km approx - to which the glacier that formed the Sound reached out beyond the current entrance to the Sound (see diagram below) to the edge of the narrow continental shelf on the Fiordland coast. How was milford sounds formed? If you know the answer to this question, please register to join our limited beta program and start the conversation right now! Wiki User 2012-02-19 15:56:16. i dont no. Sounds are formed when a river valley is flooded by the sea, whereas Milford Sound was formed by the erosion of ancient glaciers. Milford Sound Geology Today: Visible Evidence of a Rich History The shaping of Fiordland is by no means over. How Milford Sound was formed Strangely enough, Milford Sound isn’t actually a sound, it’s a fiord. Related Questions. Milford Sound has a rich and varied history and has been a resource for Maori for around 1000 years. Milford Sound sits within Fiordland National Park in the southwest of New Zealand’s South Island. How Milford Sound was Formed from the Geological Landscape It all started 400 million years ago. Glaciers in Milford Sound Within the last two million years, there were around a dozen major glacial phases in the South Island. The famous English naval commander, Captain Cook passed the entrance to Milford Sound twice and so the European “discovery” of Milford Sound is credited to Welsh adventurer John Grono. A sound is a valley that has been filled with sea water, which was formed when a river valley flooded. How was milford sound formed? Asked in Mountains How were the mountains formed at Milford Sound? At this point, Milford Sound’s world-famous mountains were under the sea, and its floors were yet to be walked by human feet. Water, wind, rain and ice continue to reshape its contours. Milford Sound is the jewel of Fiordland National Park – a hidden secret waiting to be discovered.