The geographic south pole is the place where all the lines of longitude converge in the Southern Hemisphere.
The pole your compass points toward when you head south is the magnetic south pole. That pole suffers from a case of wanderlust, moving northwest toward Australia at six to nine miles (10 to 15 kilometers) per year.
The magnetic south pole is defined by where Earth’s magnetic field lines come vertically out of the surface of the Earth. Since the field is generated by the rotation of Earth’s fluid core, it doesn’t always stay in the same place. (Read about how researchers track the magnetic south pole.)
And then there’s the ceremonial south pole, which has been set aside for photo opportunities.