Vast treeless zone between the ice cap and the timber line of North America and Eurasia (6)

I believe the answer is:

tundra

(Other definitions for tundra that I've seen before include "Treeless frozen Arctic plain" , "Area of permanently frozen subsoil" , "Arctic region of permafrost" , "Area of permafrost" , "Treeless northern region" .)

I've seen this clue in The Independent.

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