Answer:

tundras

Answer	Crossword Clue
TUNDRAS	Arctic plains
TUNDRAS	Arctic wastelands
TUNDRAS	Arctic wastes

TUNDRAS	Frozen expanses
TUNDRAS	Permafrost areas
TUNDRAS	Permafrost regions
TUNDRAS	Vast frozen expanses
TUNDRAS	Siberian expanses

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.