extreme north; North Pole
Refers to the far northern region, often in geographical or climatic contexts. Can specifically mean the North Pole.
The expedition headed for the extreme north.
The cold of the far north is beyond imagination.
utmost limit; breaking point
Figurative use for the extreme limit of something, such as patience, endurance, or a situation. Often used in phrases like 極北に達する.
His patience reached its breaking point.