Milford Sound / Piopiotahi is a spectacular glacier-carved fiord in the Fiordland National Park on the west coast of New Zealand and is one of New Zealand's most well known scenic attractions. On display is a spectacular combination of mountains, sheer cliffs, waterfalls and marine life. It is the best known of a series of fiords in the park, and the only one which is accessible by road.

Milford, Doubtful and Dusky sounds are actually all fiords, i.e., formed by glaciers. They were incorrectly named 'sounds' by Captain Cook, who charted the region in the 1770s. He bypassed Milford Sound on his journeys for fear of venturing too close to the steep mountainsides, afraid that wind conditions would prevent escape.

Hailed as the eighth Wonder of the World by Rudyard Kipling, Milford Sound has been judged as the world's top travel destination in an international survey. Over 400,000 people visit the sound every year, even though the average round trip clocks in at ten hours from Queenstown. 

- Wikivoyage