The document is about the Frigid Zone, which includes:
- The areas from 66.5°N to 90°N in the Northern Hemisphere and 66.5°S to 90°S in the Southern Hemisphere.
- It has cold summers and cold winters, with summers lasting 50-60 days. Winds include nor'easters and polar easterlies in the north, and katabatic winds in the south.
- Vegetation includes mosses, sedges, lichens, bearberry, and diamond leaf willow in the northern tundra regions.