20th century map depicting the Arctic Circle region of Earth
The Martian North Pole in 2154
A North Pole is the northernmost point of a planet. It's southern equivalent is a South Pole
Earth
On Earth, the north pole was contained within a region known as the Arctic Circle. 20th century-era maps of the Arctic Circle, including the North Pole were stored in the USS Enterprise library computer in 2254.
Mars
The North Pole of Mars was covered by an Ice cap. By 2154, it was the frequent target of comets, as part of a terraforming effort. (ENT: "Terra Prime")