'Mountains' in the Bible

they sacrifice upon the tops of the mountains, and burn incense upon the hills, under oak and poplar and terebinth, because the shade thereof is good; therefore your daughters play the harlot and your daughters-in-law commit adultery.

And the high places of Aven, the sin of Israel, shall be destroyed: the thorn and the thistle shall come up upon their altars; and they shall say to the mountains, Cover us! and to the hills, Fall on us!