1.
frigid zone, polar region
The coldest climatic zones of the Earth, located around the Arctic and Antarctic poles.
Related Words
Related:
北極圏 (Arctic Circle)
Related:
南極圏 (Antarctic Circle)
Compare:
極地 (polar region)
Related:
亜熱帯 (subtropics)
Related:
熱帯 (tropical zone)
Related:
温帯 (temperate zone)
Related:
赤道 (equator)