South Pole, southern end of the earth's axis, by convention at lat. 90° S. Because the earth's rotational axis wobbles slightly over time, the location where the southern end of the axis intersects the earth's surface shifts, although it is always within a few meters of the fixed geographic and cartographic position of the South Pole. It is distinguished from the south magnetic pole. The South Pole was reached first by Roald Amundsen, a Norwegian explorer, in 1911. See Antarctica.
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