• 国境こっきょう — national border
• 境界きょうかい — boundary line
• 県境けんざかい — prefectural boundary
• 境遇きょうぐう — circumstances
• 境地きょうち — mental state

境 is a 形声文字 (semantic–phonetic compound). The 土 radical indicates land or ground, while the phonetic 竟 provides the reading. Together, the character conveys the idea of a boundary or division between places, regions, or abstract states.