'Hills' in the Bible

Truly in vain is salvation hoped for from the hills, and from the multitude of mountains: truly in the LORD our God is the salvation of Israel.

I beheld the mountains, and, lo, they trembled, and all the hills moved lightly.

I have seen thine adulteries, and thy neighings, the lewdness of thy whoredom, and thine abominations on the hills in the fields. Woe unto thee, O Jerusalem! wilt thou not be made clean? when shall it once be?

Whilst their children remember their altars and their groves by the green trees upon the high hills.