Genesis 18:1

And the LORD appeared unto him in [by] the plains of Mamre [Hebrew - Alon Mamre, terebinth trees of Mamre]: and he sat in the tent door in the heat of the day;

Genesis 12:6

And Abram passed through the land unto the place of Sichem [or Shechem], unto the plain of Moreh"[also called "Alon Morah, the terebinth tree of Moreh]. And the Canaanite [was] then in the land.


A terebinth denotes a large tree (usually oak), and in later books of the Bible they are the groves of tree's where ritual sacrifice take place.