| gulf(nature, sink, dip, pot, bowl) |
| arroyo(noun, cut, gorge, ravine, gully) |
| channel(noun, cut, flat, line, plain) |
| coulee(noun, hollow, gorge, vale, ravine) |
| crater(noun, nature, depression, impression, dip) |
| groove(noun, line, dip, channel, bottom) |
| cavity(noun, impression, dip, hollow, cup) |
| excavation(noun, depression, impression, dip, hollow) |
| grove |
| hole(noun, depression, dish, impression, sink) |
| pass(noun, gorge, ravine, gully) |
| plain(noun, flat, hollow, gorge, vale) |
| shaft |
| well |
| combe(noun, concavity) |
| cut(noun, line, gap, channel, passage) |
| defile(noun, pass, gorge, ravine, gully) |
| lowland(noun, hollow, gorge, vale) |
| strath(noun, concavity) |
| Dene |