The line or plane indicating the limit or extent of something.

synonyms: bound, boundary.

Roget 233: limit, boundary, bounds, confine, enclave, term, bourn, verge, curbstone^†, but, pale, reservation; termination, terminus; stint, frontier, precinct, marches; backwoods.    boundary line, landmark; line of demarcation, line of circumvallation^†; pillars of Hercules; Rubicon, turning point; ne plus ultra [Lat.]; sluice, floodgate.    ... show more

Roget 230: outline, circumference; perimeter, periphery, ambit, circuit, lines tournure^†, contour, profile, silhouette; bounds; coast line.    zone, belt, girth, band, baldric, zodiac, girdle, tyre [Brit.], cingle^†, clasp, girt; cordon etc. (inclosure) 232; circlet, etc. 247.    ... show more

Dutch: grenslijn, grenslinie
Polish: granica, linia