also: ちきょう
noun
land border; boundary
Refers to the boundary line between two pieces of land, such as between properties or territories.
隣の家との地境に塀を立てた。
We built a fence on the boundary with the neighbor's house.
地境をはっきりさせるために測量を頼んだ。
We requested a survey to clarify the land border.
境界 is a more general term for any kind of boundary, including abstract ones. 地境 specifically refers to a physical land boundary.
Compound of 地 (land) and 境 (boundary). The reading じざかい is a kun'yomi compound, while ちきょう is an on'yomi reading that is rarely used.