Fiordland is a geographical region of New Zealand in the south-western corner of the South Island, comprising the westernmost third of Southland. Most of Fiordland is dominated by the steep sides of the snow-capped Southern Alps, deep lakes, and its steep, glacier-carved and now ocean-flooded western valleys. The name "Fiordland" comes from a variant spelling of the Scandinavian word for this type of steep valley, "fjord". The area of Fiordland is dominated by, and very roughly coterminous with, Fiordland National Park, New Zealand's largest National Park. Due to the often steep terrain and high amount of rainfall supporting dense vegetation, the interior of the Fiordland region is largely inaccessible. As a result, Fiordland was never subjected to notable logging operations, and even attempts at whaling, seal hunting, and mining were on a small scale and short-lived, partly also because of the challenging weather. Today, Fiordland contains by far the greatest extent of unmodified vegetation in New Zealand and significant populations of endemic plants and threatened animals, in some cases the only remaining wild populations. Fiordland features a number of fiords, which in this area are typically named sounds, reflecting the fact that sometimes fiords are considered to be a type of a narrow sound. Of the twelve major fiords on Fiordland's west coast, Milford Sound / Piopiotahi is the most famous and the only one accessible by road. Doubtful Sound / Patea, which is much larger, is also a tourist destination, but is less accessible as it requires both a boat trip over Lake Manapouri and bus transfer over Wilmot Pass. Also situated within Fiordland are Browne Falls and Sutherland Falls, which rank among the tallest waterfalls in the world, and New Zealand's three deepest lakes, Lake Hauroko, Lake Manapouri, and Lake Te Anau. Several other large lakes lie nearby, and Fiordland and the surrounding parts of Southland and Otago Regions are often referred to as the Southern Lakes. Only a handful of Fiordland's lakes are accessible by road - Lake Poteriteri is the largest lake in New Zealand with no road access. Many of the region's lakes are not even accessible via tramping tracks. This part of New Zealand, especially to the west of the mountain divide of the Southern Alps, has a very wet climate with annual average of 200 rainy days and annual rainfall varying from in Te Anau to in Milford Sound. The prevailing westerly winds