Natural heights were sometimes the sites of shrines devoted to the LORD. However, the term usually refers to the places where shrines were set up to foreign gods, especially shrines where the worship of the LORD was in rivalry with Jerusalem.
High places regarded as unsatisfactory places to worship the LORD
2 Chronicles 32:12See also2 Kings 18:4The presence of Asherah poles is evidence of a consort for the LORD, typical of Baal worship, but alien to the Biblical concept of God; 2 Chronicles 31:1