| fall(noun, verb, feature, drop, decline) |
| line(noun, area, edge, border) |
| boundary(noun, area, line, edge, border) |
| geology(noun, area, science, region) |
| border(noun, area, line, edge) |
| geological feature(expression, feature, characteristic, detail) |
| waterfall(noun, water, course, flood, stream) |
| course(noun, area, line, way, edge) |
| edge(noun, area, line, border) |
| geography(noun, area, science, region) |
| path(noun, way, course, direction) |
| territory(noun, area, zone, locality) |
| verge(noun, area, line, edge, border) |
| borderline(noun, area, line, edge, border) |
| descent(noun, area, line, edge, border) |
| frontier(noun, area, line, edge, border) |
| locality(noun, territory, area, zone) |
| rapids(noun, water, course, flood, stream) |
| row(noun, area, line, edge, border) |
| section(noun, territory, area, zone, locality) |