| landmark(noun, point) |
| divide(noun, distinction, borderline, margin) |
| water parting(noun, expression, idiom) |
| turning point(noun, expression, idiom) |
| river basin(expression, idiom) |
| basin(noun, territory, area, dish, sink) |
| drainage area(noun, expression, idiom) |
| bay(noun, dish, sink, pot, bowl) |
| catchment |
| catchment area(expression, idiom) |
| drainage basin(noun, expression, idiom, area) |
| boundary(noun, distinction, borderline, margin) |
| concavity(noun, dish, sink, pot, bowl) |
| depression(noun, dish, sink, pot, bowl) |
| dip(noun, dish, sink, pot, bowl) |
| distinction(noun, borderline, margin) |
| ewer(noun, dish, sink, pot, bowl) |
| gulf(noun, dish, sink, pot, bowl) |
| hole(noun, dish, sink, pot, bowl) |
| hollow(noun, dish, sink, pot, bowl) |