Boundary

грани́ца

graníca

(dividing line or location between two areas)

грани́ца

graníca

((topology) the set of points in the closure, not belonging to the interior)

границы

granicy

(bounds, confines, or limits between immaterial things)

край

kraj

((topology) the set of points in the closure, not belonging to the interior)

межа́

mežá

(dividing line or location between two areas)