Milford Sound (Piopiotahi in Māori) is a fjord in the south west of New Zealand's South Island, within Fiordland National Park and the Te Wahipounamu World Heritage site. It has been judged the world's top travel destination in an international survey, and is acclaimed as New Zealand's most famous tourist destination. Rudyard Kipling had previously called it the eighth Wonder of the World.
Etymology
Milford Sound is named after Milford Haven in Wales, while the Cleddau River which flows into the sound is also named for its Welsh namesake. The Māori named the sound Piopiotahi after the thrush-like piopio bird, now extinct. Piopiotahi means "a single piopio", harking back to the legend of Māui trying to win immortality for mankind - when Maui died in the attempt, a piopio was said to have flown here in mourning.
Geography

Milford Sound runs 15 kilometres inland from the Tasman Sea and is surrounded by sheer rock faces that rise 1,200 metres or more on either side. Among the peaks are The Elephant at 1,517 m (4,977 ft), said to resemble an elephant's head,[5] and Lion Mountain, 1,302 m (4,271 ft), in the shape of a crouching lion.[6] Lush rain forests cling precariously to these cliffs, while seals, penguins, and dolphins frequent the waters.
Climate

With a mean annual rainfall of 6,813 mm on 182 days a year,[7] a high level even for the West Coast, Milford Sound is known as the wettest inhabited place in New Zealand and one of the wettest in the world. Rainfall can reach 250 mm during a span of 24 hours.[8] The rainfall creates dozens of temporary waterfalls (as well as a number of major, more permanent ones) cascading down the cliff faces, some reaching a thousand metres in length. Smaller falls from such heights may never reach the bottom of the sound, drifting away in the wind.

Accumulated rainwater can at times cause portions of the rain forest to lose their grip on the sheer cliff faces, resulting in tree avalanches into the sound. The regrowth of the rain forest after these avalanches can be seen in several locations along the sound.
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