Exploration of Earth's wilderness areas became an international obsession in the late 19th and early 20th centuries, as economically advantaged nations, in particular European powers and the United States were well equipped to mount exhaustive expeditions. From previously inaccessible forests and jungle country to the world's great mountain ranges, adventurers sought out the greatest extremes of climate and terrain in a race to plant the first flag where humanity struggled to survive. An earlier wave of explorers led to the opening of the New World, and early polar expeditions saw ancient ships of various nations sail along the coastlines of Greenland and within reach of the Arctic and Antarctic continents. Many 19th century figures approached the polar region with an eye to traversing it. Most notable among them was British explorer Sir James Clark Ross, who took the Erebus and the HMS Terror to the southernmost coastlines of the planet. Ross is probably the first explorer to realize that Antarctica was a continent and not just a large chain of islands, and he discovered the section of the shelf that was to become the Victoria Barrier. Asian nations also took part in Antarctic exploration when Nobu Shirase of Japan mounted his 1911 expedition, while Sir Edgeworth David, a Welsh-Australian, was the first person to successfully reach the summit of Mt. Erebus. Richard Evelyn Byrd is believed to be the first pilot to cross the Antarctic continent, and even well past the era of great polar expeditions, British figures such as Edmund Hillary, conqueror of Mount Everest, made several expeditions to the South Pole. Nevertheless, the golden age of polar exploration of the furthermost continents did not reach its zenith until the turn of the 20th century, and national rivalries abounded between the major seafaring nations of the world.
