KanjiJLPT N2
Boundary

boundary, border, region

Mnemonic

You heap earth into a tall ridge and stare fiercely over it. This wall of earth is the boundary—anyone who dares cross it will meet your unblinking stare, a silent warning that one realm ends here and another begins.
Additional thoughts
Picture yourself standing on a dirt ridge, eyes locked forward like a sentinel. The earth under your feet IS the dividing line; your intense stare enforces it. Earth + Stare = Boundary.
Quick recall
Pile up earth into a ridge, then stare over it—that's your boundary.

Details

The keyword for 境 is boundary. This kanji refers to a border, limit, or dividing line between two areas, regions, or states of being. It can denote both physical boundaries, such as the border between territories or countries, and more abstract boundaries, such as the line between different conditions, circumstances, or stages of life. It carries the sense of a place or point where one realm ends and another begins.
On'yomi
きょう、けい
Kun'yomi
さかい