The meaning of Landmark in the Bible
(From International Standard Bible Encyclopedia)

land'-mark (gebhul, literally, "boundary"): The boundary may have been marked, as at present, simply by a furrow or stone. The iniquity of removing a landmark is frequently insisted on (Deuteronomy 19:14; Deuteronomy 27:17; Proverbs 22:28; Proverbs 23:10; Job 24:2 gebhulah), its removal being equivalent to theft.

See more on the meaning of Landmark in the Bible:
Landmark {Easton's Bible Dictionary}

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