Answer:

wold

Answer	Crossword Clue
WOLD	An upland plain.
WOLD	Upland plain.
WOLD	Treeless plain.

WOLD	High treeless plain.
WOLD	High, rolling plain.
WOLD	Open country
WOLD	Open hillside
WOLD	Forest, in Frankfurt
WOLD	Elevated, open country
WOLD	Chain of treeless rolling hills