All the places; temples, chapels, altars, groves, as appears from other scriptures. The Gentiles used to employ the high mountains for their idolatry; \see Isaiah 57:5,7 Eze 6:13 Hosea 4:13\ and as they consecrated divers trees to their false gods, so they worshipped these under them:
Related Commentaries of Deuteronomy 12:2
Deuteronomy 12:2
2 Ye shall utterly destroy all the places, wherein the nations which ye shall possessa served their gods, upon the high mountains, and upon the hills, and under every green tree: