| ambit(noun, line, limit, edge, border) |
| boundary(noun, environment, limit, border, borderline) |
| adjacency(noun, environment, compass, vicinity) |
| barrier(border, borderline, frontier) |
| beginning(border, borderline, frontier) |
| border(borderline, frontier) |
| borderland(border, borderline, frontier) |
| borderline(border, frontier) |
| bounds(border, borderline, frontier) |
| brink(border, borderline, frontier) |
| circumference(border, borderline, frontier) |
| circumscription(border, borderline, frontier) |
| compass(border, borderline, frontier) |
| confines(border, borderline, frontier) |
| edge(border, borderline, frontier) |
| end(border, borderline, frontier) |
| environs(border, borderline, frontier) |
| extent(border, borderline, frontier) |
| extremity(border, borderline, frontier) |
| frame(border, borderline, frontier) |