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A pole of inaccessibility marks a location that is the most challenging to reach owing to its remoteness from geographical features that could provide access. Often it refers to the most distant point from the coastline. The term describes a geographic construct, not an actual physical phenomenon. Subject to varying definitions, it is of interest mostly to explorers and adventurers. ==Northern pole of inaccessibility== The northern pole of inaccessibility, sometimes known as the Arctic pole of inaccessibility, or just Arctic pole, is located on the Arctic Ocean pack ice at a distance farthest from any land mass. Long thought to lie at , it was from the North Pole, north of Barrow, Alaska, and equidistant from the three closest landmasses, Ellesmere Island, Franz-Josef Land, and the New Siberian Islands, away. This follows from simple geometry, where three points suffice to define a circle; the pole of inaccessibility is then defined as the center of the largest circle that can be drawn within the Arctic ocean without including any land. It was first crossed by Sir Hubert Wilkins, who flew by aircraft in 1927; in 1958, a Soviet icebreaker reached this point. Owing to the constant motion of the pack ice, no permanent structure can exist at that pole. According to some reports, the first person to reach the spot on foot was Sir Wally Herbert, who arrived by dogsled in 1968. Other reports speak of this Pole as being still unconquered as of explorer Jim McNeill's unsuccessful attempt in 2006. According to McNeill, Herbert did not quite make the Pole, whose position has also now been more accurately determined. A recent review of satellite cartography revealed that the pole actually lies at , away from the previous location, from Ellesmere, Komsomolets and Genriyetta Islands. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「pole of inaccessibility」の詳細全文を読む スポンサード リンク
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