Mountains: Often Selected As Places for Idolatrous Worship
Source: TTT
Deuteronomy 12:2
Destroy completely all the places where the nations you are dispossessing have served their gods—atop the high mountains, on the hills, and under every green tree.
2 Chronicles 21:11
Jehoram had also built high places on the hills of Judah; he had caused the people of Jerusalem to prostitute themselves and had led Judah astray.